Phase7b: Manual Invoice

src/app/[locale]/admin/billing/invoice-drafts/[id]/page.tsx

@@ -0,0 +1,59 @@
+import { notFound, redirect } from "next/navigation";
+import { getTranslations } from "next-intl/server";
+import { getSessionUser } from "@/lib/session";
+import { getInvoiceDraftById, getOrgBilling } from "@/lib/db";
+import { BackLink } from "@/components/ui/back-link";
+import { CustomInvoiceEditor } from "@/components/admin/billing/custom-invoice-editor";
+
+/**
+ * /admin/billing/invoice-drafts/[id] — full editor for an
+ * in-progress custom invoice.
+ *
+ * Phase 8. Server-loads the draft + the org's billing snapshot
+ * (used to display the bill-to block preview), then hands off to
+ * the client editor for the interactive line-management UI.
+ *
+ * The snapshot is loaded read-only for display. The actual VAT
+ * computation happens server-side at issue time via
+ * computeCustomInvoiceTotals, which re-reads the same snapshot.
+ * That two-time read is intentional: the editor's preview math
+ * is a hint, the issue-time read is authoritative — if the
+ * customer updates their billing address between Draft and Issue,
+ * the invoice reflects the new address.
+ */
+export default async function InvoiceDraftEditorPage({
+  params,
+}: {
+  params: Promise<{ id: string }>;
+}) {
+  const user = await getSessionUser();
+  if (!user) redirect("/login");
+  if (!user.isPlatform) redirect("/dashboard");
+  const t = await getTranslations("adminBilling");
+
+  const { id } = await params;
+  const draft = await getInvoiceDraftById(id);
+  if (!draft) notFound();
+  const orgBilling = await getOrgBilling(draft.zitadelOrgId).catch(() => null);
+
+  return (
+    <main className="max-w-5xl mx-auto px-6 py-8">
+      <BackLink
+        href="/admin/billing/invoice-drafts"
+        label={t("backToDrafts")}
+      />
+      <div className="mb-6">
+        <h1 className="font-display text-2xl font-semibold accent-rule">
+          {t("editorPageTitle")}
+        </h1>
+        <p className="text-sm text-text-secondary mt-3">
+          {orgBilling?.companyName ?? draft.zitadelOrgId}
+        </p>
+      </div>
+      <CustomInvoiceEditor
+        draft={draft}
+        orgBilling={orgBilling}
+      />
+    </main>
+  );
+}

src/app/[locale]/admin/billing/invoice-drafts/page.tsx

@@ -0,0 +1,72 @@
+import { redirect } from "next/navigation";
+import { getTranslations } from "next-intl/server";
+import { getSessionUser } from "@/lib/session";
+import { getOrgBilling, listAllInvoiceDrafts } from "@/lib/db";
+import { listTenants } from "@/lib/k8s";
+import { BackLink } from "@/components/ui/back-link";
+import { DraftList } from "@/components/admin/billing/draft-list";
+
+/**
+ * /admin/billing/invoice-drafts — list of all open custom-invoice
+ * drafts across orgs.
+ *
+ * Phase 8. Each draft is a JSONB blob the admin is composing into
+ * an invoice; visible only to platform admins. From here the admin
+ * can resume editing or discard.
+ *
+ * Building an org-name map by reading tenant labels (for the set of
+ * known orgs) + getOrgBilling per org (for the actual company name)
+ * so the table can show "Customer X" instead of a raw ZITADEL org id.
+ */
+export default async function AdminInvoiceDraftsPage() {
+  const user = await getSessionUser();
+  if (!user) redirect("/login");
+  if (!user.isPlatform) redirect("/dashboard");
+  const t = await getTranslations("adminBilling");
+
+  const [drafts, tenants] = await Promise.all([
+    listAllInvoiceDrafts(),
+    listTenants().catch(() => []),
+  ]);
+
+  // Build the set of distinct ZITADEL org ids from tenant labels,
+  // PLUS the set referenced by any current draft. Drafts may target
+  // orgs that don't have tenants yet (rare but possible), so we
+  // union both sources before fetching billing rows.
+  const orgIds = new Set<string>();
+  for (const tnt of tenants) {
+    const oid = tnt.metadata.labels?.["pieced.ch/zitadel-org-id"];
+    if (oid) orgIds.add(oid);
+  }
+  for (const d of drafts) {
+    orgIds.add(d.zitadelOrgId);
+  }
+  // Look up billing in parallel — same pattern as
+  // /api/admin/billing/orgs uses. Failure for any single org is
+  // non-fatal (falls back to the raw id in the table).
+  const orgNamePairs = await Promise.all(
+    Array.from(orgIds).map(async (oid) => {
+      const billing = await getOrgBilling(oid).catch(() => null);
+      return [oid, billing?.companyName ?? null] as const;
+    })
+  );
+  const orgNameMap: Record<string, string> = {};
+  for (const [oid, name] of orgNamePairs) {
+    if (name) orgNameMap[oid] = name;
+  }
+
+  return (
+    <main className="max-w-5xl mx-auto px-6 py-8">
+      <BackLink href="/admin/billing" label={t("backToBilling")} />
+      <div className="mb-6">
+        <h1 className="font-display text-2xl font-semibold accent-rule">
+          {t("draftsPageTitle")}
+        </h1>
+        <p className="text-sm text-text-secondary mt-3">
+          {t("draftsPageSubtitle")}
+        </p>
+      </div>
+      <DraftList drafts={drafts} orgNameMap={orgNameMap} />
+    </main>
+  );
+}

src/app/[locale]/admin/billing/invoices/[id]/page.tsx

@@ -1,7 +1,7 @@
 import { notFound, redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { getSessionUser } from "@/lib/session";
-import { getInvoiceDetail } from "@/lib/db";
+import { getInvoiceDetail, listCreditNotesForInvoice } from "@/lib/db";
 import { BackLink } from "@/components/ui/back-link";
 import { InvoiceDetailView } from "@/components/admin/billing/invoice-detail-view";
 
@@ -9,8 +9,12 @@ import { InvoiceDetailView } from "@/components/admin/billing/invoice-detail-vie
  * /admin/billing/invoices/[id] — full detail of one invoice.
  *
  * Server-renders the static body (header, lines, totals, billing
- * snapshot); the action bar (mark-paid, delete, PDF download) is
- * a client component for the interactive bits.
+ * snapshot); the action bar (mark-paid, void, refund, delete, PDF
+ * download) is a client component for the interactive bits.
+ *
+ * Phase 7: also passes any linked credit notes so the detail view
+ * can show the "this invoice was voided / partially refunded" panel
+ * without an extra round-trip.
  */
 export default async function AdminInvoiceDetailPage({
   params,
@@ -25,11 +29,12 @@ export default async function AdminInvoiceDetailPage({
   const { id } = await params;
   const detail = await getInvoiceDetail(id);
   if (!detail) notFound();
+  const creditNotes = await listCreditNotesForInvoice(id);
 
   return (
     <main className="max-w-4xl mx-auto px-6 py-8">
       <BackLink href="/admin/billing/invoices" label={t("backToInvoices")} />
-      <InvoiceDetailView detail={detail} />
+      <InvoiceDetailView detail={detail} creditNotes={creditNotes} />
     </main>
   );
 }

src/app/[locale]/admin/billing/invoices/new/page.tsx

@@ -0,0 +1,72 @@
+import { redirect } from "next/navigation";
+import { getTranslations } from "next-intl/server";
+import { getSessionUser } from "@/lib/session";
+import { listTenants } from "@/lib/k8s";
+import { getOrgBilling } from "@/lib/db";
+import { BackLink } from "@/components/ui/back-link";
+import { NewInvoiceForm } from "@/components/admin/billing/new-invoice-form";
+
+/**
+ * /admin/billing/invoices/new — entry point for the custom-invoice
+ * flow. The admin picks an org, clicks Continue, and lands on the
+ * editor at /admin/billing/invoice-drafts/<new-id>.
+ *
+ * Phase 8. Org list is built from tenant labels + each org's
+ * billing config (we need the company name and the
+ * has-billing-snapshot flag to gate the picker — orgs without a
+ * snapshot can't be invoiced until they complete onboarding or
+ * admin sets the billing info manually).
+ */
+export default async function NewInvoicePage() {
+  const user = await getSessionUser();
+  if (!user) redirect("/login");
+  if (!user.isPlatform) redirect("/dashboard");
+  const t = await getTranslations("adminBilling");
+
+  // Tenants give us org membership; getOrgBilling per org gives us
+  // the snapshot status. We dedupe by org id since one org can own
+  // many tenants.
+  const tenants = await listTenants();
+  const orgIds = new Set<string>();
+  for (const tnt of tenants) {
+    const oid = tnt.metadata.labels?.["pieced.ch/zitadel-org-id"];
+    if (oid) orgIds.add(oid);
+  }
+  const orgs = await Promise.all(
+    Array.from(orgIds).map(async (oid) => {
+      const billing = await getOrgBilling(oid).catch(() => null);
+      return {
+        zitadelOrgId: oid,
+        companyName: billing?.companyName ?? null,
+        country: billing?.country ?? null,
+        hasBillingAddress: !!billing && !!billing.companyName,
+      };
+    })
+  );
+  // Sort: orgs with billing first (admin's most likely target),
+  // then alphabetically by company name.
+  orgs.sort((a, b) => {
+    if (a.hasBillingAddress !== b.hasBillingAddress) {
+      return a.hasBillingAddress ? -1 : 1;
+    }
+    return (a.companyName ?? "").localeCompare(b.companyName ?? "");
+  });
+
+  return (
+    <main className="max-w-2xl mx-auto px-6 py-8">
+      <BackLink
+        href="/admin/billing/invoices"
+        label={t("backToInvoices")}
+      />
+      <div className="mb-6">
+        <h1 className="font-display text-2xl font-semibold accent-rule">
+          {t("newInvoicePageTitle")}
+        </h1>
+        <p className="text-sm text-text-secondary mt-3">
+          {t("newInvoicePageSubtitle")}
+        </p>
+      </div>
+      <NewInvoiceForm orgs={orgs} />
+    </main>
+  );
+}

src/app/[locale]/billing/page.tsx

@@ -1,23 +1,30 @@
 import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { getSessionUser } from "@/lib/session";
-import { listInvoices, syncOverdueInvoices } from "@/lib/db";
+import {
+  listCreditNotesForOrg,
+  listInvoices,
+  syncOverdueInvoices,
+} from "@/lib/db";
 import { CustomerInvoiceList } from "@/components/billing/customer-invoice-list";
+import { CustomerCreditNoteList } from "@/components/billing/customer-credit-note-list";
 import { RunningTotalWidget } from "@/components/billing/running-total-widget";
 
 /**
  * /billing — customer's billing home.
  *
- * Shows two things:
+ * Shows three things:
  *   1. RunningTotalWidget — current calendar month's accruing cost
  *      (or the already-issued invoice for the current month, if
  *      that ran early).
  *   2. CustomerInvoiceList — every issued invoice for this org,
  *      newest first. Status is reflected with a colored badge.
+ *   3. CustomerCreditNoteList — Phase 7. Credit notes (voids and
+ *      refunds) for this org, with PDF download links. Hidden
+ *      entirely when there are none (the common case).
  *
  * Anyone signed in can view this. The data is org-scoped; even
- * non-owner team members see the same view. Phase 4 will add a
- * "settings.payByInvoice" toggle visibility-gated to owners only.
+ * non-owner team members see the same view.
  */
 export default async function CustomerBillingPage() {
   const user = await getSessionUser();
@@ -31,10 +38,11 @@ export default async function CustomerBillingPage() {
     console.warn("syncOverdueInvoices failed in /billing:", e);
   }
 
-  const invoices = await listInvoices({
-    zitadelOrgId: user.orgId,
-    limit: 200,
-  });
+  // Parallel fetch — invoices + credit notes are independent.
+  const [invoices, creditNotes] = await Promise.all([
+    listInvoices({ zitadelOrgId: user.orgId, limit: 200 }),
+    listCreditNotesForOrg(user.orgId, 200),
+  ]);
 
   return (
     <main className="max-w-5xl mx-auto px-6 py-8">
@@ -54,12 +62,24 @@ export default async function CustomerBillingPage() {
         <RunningTotalWidget isOwner={user.roles.includes("owner")} />
       </section>
 
-      <section className="animate-in animate-in-delay-2">
+      <section className="animate-in animate-in-delay-2 mb-8">
         <h2 className="text-xs font-semibold uppercase tracking-wider text-text-muted mb-3">
           {t("historyHeading")}
         </h2>
         <CustomerInvoiceList invoices={invoices} />
       </section>
+
+      {/* Phase 7: credit-note section. CustomerCreditNoteList itself
+          returns null when there are no credit notes, so this whole
+          section disappears for orgs in normal operation. */}
+      {creditNotes.length > 0 && (
+        <section className="animate-in animate-in-delay-3">
+          <h2 className="text-xs font-semibold uppercase tracking-wider text-text-muted mb-3">
+            {t("creditNotesHeading")}
+          </h2>
+          <CustomerCreditNoteList creditNotes={creditNotes} />
+        </section>
+      )}
     </main>
   );
 }

src/app/api/admin/billing/invoice-drafts/[id]/issue/route.ts

@@ -0,0 +1,64 @@
+import { NextResponse } from "next/server";
+import { getSessionUser, requirePlatformRole } from "@/lib/session";
+import {
+  CustomInvoiceValidationError,
+  issueCustomInvoiceDraft,
+} from "@/lib/billing";
+import { safeError } from "@/lib/errors";
+
+/**
+ * POST /api/admin/billing/invoice-drafts/[id]/issue
+ *
+ * Phase 8. Convert a draft into a real invoice:
+ *   - Validate payload (must have lines, valid dates, billing snapshot)
+ *   - Allocate invoice number from the shared year-scoped counter
+ *   - Persist invoice with source='custom'
+ *   - Render PDF
+ *   - Email customer
+ *   - Delete the draft
+ *
+ * Returns the issued Invoice on success. Errors map cleanly to
+ * HTTP codes:
+ *   400 — validation failure (CustomInvoiceValidationError)
+ *   404 — draft id doesn't exist (also CustomInvoiceValidationError
+ *         since the orchestrator can't tell apart "draft missing"
+ *         from "invalid input" — the message string discriminates)
+ *   500 — anything else (DB error, Stripe error not applicable here)
+ *
+ * Idempotency: this endpoint is NOT idempotent. Issuing twice
+ * allocates two invoice numbers. The admin UI disables the submit
+ * button while in-flight, but for safety the backend handles
+ * double-submit by failing on the second call (the draft was
+ * deleted by the first).
+ */
+export async function POST(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  let user;
+  try {
+    await requirePlatformRole();
+    user = await getSessionUser();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const { id } = await params;
+  try {
+    const invoice = await issueCustomInvoiceDraft({
+      draftId: id,
+      issuedBy: user.id,
+    });
+    return NextResponse.json({ invoice });
+  } catch (e) {
+    if (e instanceof CustomInvoiceValidationError) {
+      return NextResponse.json({ error: e.message }, { status: 400 });
+    }
+    return NextResponse.json(
+      { error: safeError(e, "Failed to issue custom invoice") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/admin/billing/invoice-drafts/[id]/preview/route.ts

@@ -0,0 +1,52 @@
+import { NextResponse } from "next/server";
+import { requirePlatformRole } from "@/lib/session";
+import {
+  CustomInvoiceValidationError,
+  renderCustomDraftPreview,
+} from "@/lib/billing";
+import { safeError } from "@/lib/errors";
+
+/**
+ * GET /api/admin/billing/invoice-drafts/[id]/preview
+ *
+ * Phase 8. Render the current draft as a PDF without persisting an
+ * invoice. The bytes are returned inline so the browser displays
+ * the document in a new tab. The invoice number on the rendered
+ * PDF is the placeholder "DRAFT" — no real number is allocated.
+ *
+ * Useful for the admin's "Review" step in the draft → review →
+ * issue flow.
+ */
+export async function GET(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    await requirePlatformRole();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const { id } = await params;
+  try {
+    const pdf = await renderCustomDraftPreview(id);
+    return new NextResponse(new Uint8Array(pdf), {
+      status: 200,
+      headers: {
+        "Content-Type": "application/pdf",
+        // Inline so the browser displays the PDF immediately. The
+        // filename is a guide — most browsers ignore it for inline
+        // disposition but it shows on the "Save as" dialog.
+        "Content-Disposition": `inline; filename="invoice-draft-${id}.pdf"`,
+        "Cache-Control": "no-store",
+      },
+    });
+  } catch (e) {
+    if (e instanceof CustomInvoiceValidationError) {
+      return NextResponse.json({ error: e.message }, { status: 400 });
+    }
+    return NextResponse.json(
+      { error: safeError(e, "Failed to render preview") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/admin/billing/invoice-drafts/[id]/route.ts

@@ -0,0 +1,120 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { requirePlatformRole } from "@/lib/session";
+import {
+  deleteInvoiceDraft,
+  getInvoiceDraftById,
+  updateInvoiceDraft,
+} from "@/lib/db";
+import { safeError } from "@/lib/errors";
+import type { CustomInvoiceDraftPayload } from "@/types";
+
+/**
+ * /api/admin/billing/invoice-drafts/[id]
+ *
+ * Phase 8.
+ *
+ *   GET    — fetch one draft
+ *   PUT    — overwrite the payload (full replace, not patch)
+ *   DELETE — discard the draft
+ *
+ * All require platform admin. The org boundary is *not* enforced
+ * here: a platform admin can edit any draft regardless of which
+ * org it targets. If we ever introduce a per-org admin role,
+ * scope filtering would go in this file.
+ */
+
+const lineSchema = z.object({
+  description: z.string().trim().min(1).max(500),
+  quantity: z.number().finite(),
+  unitPriceChf: z.number().finite(),
+});
+
+const payloadSchema = z.object({
+  issueDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+  dueDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+  locale: z.enum(["de", "en", "fr", "it"]),
+  paymentMethod: z.enum(["invoice", "card"]),
+  adminNotes: z.string().max(2000).optional(),
+  lines: z.array(lineSchema).max(100),
+});
+
+export async function GET(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    await requirePlatformRole();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const { id } = await params;
+  try {
+    const draft = await getInvoiceDraftById(id);
+    if (!draft) {
+      return NextResponse.json({ error: "Not found" }, { status: 404 });
+    }
+    return NextResponse.json({ draft });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Failed to load draft") },
+      { status: 500 }
+    );
+  }
+}
+
+export async function PUT(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    await requirePlatformRole();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const { id } = await params;
+  const body = await request.json().catch(() => ({}));
+  const parsed = payloadSchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid request", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+  try {
+    const updated = await updateInvoiceDraft(
+      id,
+      parsed.data as CustomInvoiceDraftPayload
+    );
+    if (!updated) {
+      return NextResponse.json({ error: "Not found" }, { status: 404 });
+    }
+    return NextResponse.json({ draft: updated });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Failed to update draft") },
+      { status: 500 }
+    );
+  }
+}
+
+export async function DELETE(
+  _request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  try {
+    await requirePlatformRole();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const { id } = await params;
+  try {
+    const deleted = await deleteInvoiceDraft(id);
+    return NextResponse.json({ deleted });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Failed to delete draft") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/admin/billing/invoice-drafts/route.ts

@@ -0,0 +1,94 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { requirePlatformRole, getSessionUser } from "@/lib/session";
+import {
+  createInvoiceDraft,
+  listAllInvoiceDrafts,
+} from "@/lib/db";
+import { safeError } from "@/lib/errors";
+import type { CustomInvoiceDraftPayload } from "@/types";
+
+/**
+ * /api/admin/billing/invoice-drafts
+ *
+ * Phase 8. Drafts for the admin "New invoice" flow.
+ *
+ *   GET  — list all open drafts across all orgs, newest-touched first.
+ *   POST — create a new draft for an org with an initial (possibly
+ *          empty) payload. Returns the inserted draft.
+ *
+ * Both require platform admin. Drafts have no customer-facing
+ * surface: they aren't reachable from /billing or any non-admin
+ * route.
+ */
+
+const lineSchema = z.object({
+  description: z.string().trim().min(1).max(500),
+  quantity: z.number().finite(),
+  unitPriceChf: z.number().finite(),
+});
+
+const payloadSchema = z.object({
+  issueDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+  dueDate: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+  locale: z.enum(["de", "en", "fr", "it"]),
+  paymentMethod: z.enum(["invoice", "card"]),
+  adminNotes: z.string().max(2000).optional(),
+  lines: z.array(lineSchema).max(100),
+});
+
+const createSchema = z.object({
+  zitadelOrgId: z.string().trim().min(1),
+  payload: payloadSchema,
+});
+
+export async function GET() {
+  try {
+    await requirePlatformRole();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  try {
+    const drafts = await listAllInvoiceDrafts();
+    return NextResponse.json({ drafts });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Failed to list drafts") },
+      { status: 500 }
+    );
+  }
+}
+
+export async function POST(request: Request) {
+  let user;
+  try {
+    await requirePlatformRole();
+    user = await getSessionUser();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const body = await request.json().catch(() => ({}));
+  const parsed = createSchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid request", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+  try {
+    const draft = await createInvoiceDraft({
+      zitadelOrgId: parsed.data.zitadelOrgId,
+      createdBy: user.id,
+      payload: parsed.data.payload as CustomInvoiceDraftPayload,
+    });
+    return NextResponse.json({ draft });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Failed to create draft") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/admin/billing/invoices/[id]/refund/route.ts

@@ -0,0 +1,88 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { requirePlatformRole, getSessionUser } from "@/lib/session";
+import { refundInvoice, RefundNotAllowedError } from "@/lib/billing";
+import { safeError } from "@/lib/errors";
+
+/**
+ * POST /api/admin/billing/invoices/[id]/refund
+ *
+ * Phase 7. Refunds a paid invoice (full or partial) and issues a
+ * credit note. For Stripe-paid invoices, calls Stripe's Refund API
+ * before any local recording. For invoice-paid customers (bank
+ * transfer), records the refund locally and assumes the admin
+ * handled the actual money movement out-of-band.
+ *
+ * Body:
+ *   {
+ *     amountChf: number,   // positive, <= remaining refundable
+ *     reason: string       // required, free-text, max 500
+ *   }
+ *
+ * Authorization: platform admin.
+ *
+ * Status codes:
+ *   200 — refund issued, credit note returned
+ *   400 — bad request (zero/negative amount, etc.)
+ *   401 / 403 — not authenticated / not platform admin
+ *   409 — invoice not in a refundable state, or amount exceeds remaining
+ *   500 — Stripe call failed or another internal error
+ *
+ * Idempotency caveats: this endpoint is NOT idempotent against
+ * client retries. Issuing two refunds quickly will result in two
+ * Stripe refund calls (and two credit notes). The admin UI should
+ * disable the submit button while the request is in flight to
+ * prevent accidental double-clicks. The Stripe charge.refunded
+ * webhook is idempotent and will not double-count if it fires
+ * after this endpoint already recorded the refund.
+ */
+
+const bodySchema = z.object({
+  amountChf: z.number().positive().multipleOf(0.01),
+  reason: z.string().trim().min(1).max(500),
+});
+
+export async function POST(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  let user;
+  try {
+    await requirePlatformRole();
+    user = await getSessionUser();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const { id } = await params;
+  const body = await request.json().catch(() => ({}));
+  const parsed = bodySchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid request", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+  try {
+    const creditNote = await refundInvoice({
+      invoiceId: id,
+      amountChf: parsed.data.amountChf,
+      reason: parsed.data.reason,
+      refundedBy: user.id,
+    });
+    return NextResponse.json({ creditNote });
+  } catch (e) {
+    if (e instanceof RefundNotAllowedError) {
+      return NextResponse.json(
+        { error: e.message, currentStatus: e.currentStatus },
+        { status: 409 }
+      );
+    }
+    return NextResponse.json(
+      { error: safeError(e, "Refund failed") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/admin/billing/invoices/[id]/void/route.ts

@@ -0,0 +1,77 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { requirePlatformRole, getSessionUser } from "@/lib/session";
+import { voidInvoice, VoidNotAllowedError } from "@/lib/billing";
+import { safeError } from "@/lib/errors";
+
+/**
+ * POST /api/admin/billing/invoices/[id]/void
+ *
+ * Phase 7. Voids an unpaid invoice and issues a credit note.
+ *
+ * Body:
+ *   {
+ *     reason: string  // required, free-text, max 500
+ *   }
+ *
+ * Authorization: platform admin (same as mark-paid, generate, etc.).
+ * The acting user's ID lands in invoices.voided_by and on the
+ * credit_notes.issued_by audit columns.
+ *
+ * Status codes:
+ *   200 — voided, credit note returned in body
+ *   400 — bad request (missing reason etc.)
+ *   401 / 403 — not authenticated / not platform admin
+ *   409 — invoice not in a voidable state
+ *   500 — anything else (Stripe shouldn't apply here, but if PDF
+ *         render fails the void still went through — see body
+ *         payload for the credit-note number to re-render later)
+ */
+
+const bodySchema = z.object({
+  reason: z.string().trim().min(1).max(500),
+});
+
+export async function POST(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  let user;
+  try {
+    await requirePlatformRole();
+    user = await getSessionUser();
+  } catch {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const { id } = await params;
+  const body = await request.json().catch(() => ({}));
+  const parsed = bodySchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid request", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+  try {
+    const creditNote = await voidInvoice({
+      invoiceId: id,
+      reason: parsed.data.reason,
+      voidedBy: user.id,
+    });
+    return NextResponse.json({ creditNote });
+  } catch (e) {
+    if (e instanceof VoidNotAllowedError) {
+      return NextResponse.json(
+        { error: e.message, currentStatus: e.currentStatus },
+        { status: 409 }
+      );
+    }
+    return NextResponse.json(
+      { error: safeError(e, "Void failed") },
+      { status: 500 }
+    );
+  }
+}

src/app/api/credit-notes/[number]/pdf/route.ts

@@ -0,0 +1,64 @@
+import { NextResponse } from "next/server";
+import { getSessionUser } from "@/lib/session";
+import {
+  getCreditNoteByNumber,
+  getCreditNoteByNumberForOrg,
+  getCreditNotePdf,
+} from "@/lib/db";
+
+/**
+ * GET /api/credit-notes/[number]/pdf
+ *
+ * Phase 7. Customer-facing PDF download for a credit note. Returns
+ * the binary PDF with Content-Disposition: inline so the browser
+ * renders it in-tab (matching the invoice download behaviour). The
+ * customer's email links here.
+ *
+ * Authorization:
+ *   - The caller must be authenticated.
+ *   - For customer-org callers, the credit note must belong to their
+ *     org (orgId-scoped lookup).
+ *   - Platform admins can fetch any credit note (cross-org lookup).
+ *
+ * Returns 404 in both "doesn't exist" and "exists but not yours"
+ * cases — leak-safe identical to invoice lookup.
+ */
+export async function GET(
+  _request: Request,
+  { params }: { params: Promise<{ number: string }> }
+) {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const { number } = await params;
+  // URL-decoded number — the route param comes URL-encoded.
+  const decodedNumber = decodeURIComponent(number);
+  const cn = user.isPlatform
+    ? await getCreditNoteByNumber(decodedNumber)
+    : await getCreditNoteByNumberForOrg(decodedNumber, user.orgId);
+  if (!cn) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+  const pdf = await getCreditNotePdf(cn.id);
+  if (!pdf) {
+    // The credit note exists but the PDF was never attached. Most
+    // likely a render failure during issuance — the credit note
+    // row is still authoritative, the PDF needs re-rendering.
+    return NextResponse.json(
+      {
+        error:
+          "Credit note exists but its PDF has not been rendered. Please contact support.",
+      },
+      { status: 502 }
+    );
+  }
+  return new NextResponse(new Uint8Array(pdf.data), {
+    status: 200,
+    headers: {
+      "Content-Type": "application/pdf",
+      "Content-Disposition": `inline; filename="${pdf.filename}"`,
+      "Cache-Control": "private, no-cache",
+    },
+  });
+}

src/app/api/stripe/webhook/route.ts

@@ -2,11 +2,14 @@ import { NextResponse } from "next/server";
 import type Stripe from "stripe";
 import { getStripeClient, getWebhookSecret } from "@/lib/stripe";
 import {
+  getInvoiceByStripePaymentIntent,
+  isStripeRefundRecorded,
   markInvoicePaid,
   markStripeEventProcessed,
   setInvoiceStripePaymentIntent,
   tryRecordStripeEvent,
 } from "@/lib/db";
+import { refundInvoice, RefundNotAllowedError } from "@/lib/billing";
 
 /**
  * POST /api/stripe/webhook
@@ -209,13 +212,103 @@ async function handleCheckoutCompleted(
 }
 
 async function handleChargeRefunded(charge: Stripe.Charge): Promise<void> {
-  // v1 scope: log only. Refunds always go through Stripe → admin
-  // initiates them in the dashboard. Updating our invoice status
-  // to 'void' or partial-credit needs more product thinking
-  // (partial refunds? credit notes? VAT corrections?). Phase 7.
-  console.log(
-    `Charge ${charge.id} refunded (amount ${charge.amount_refunded} ${charge.currency}); no portal-side state change.`
-  );
+  // Phase 7: mirror Stripe refunds into the portal so credit notes
+  // are issued for refunds initiated in the Stripe Dashboard. For
+  // refunds initiated via /api/admin/.../refund, this handler is a
+  // no-op (each refund's stripe_refund_id is already recorded
+  // before the webhook lands — refundInvoice records it
+  // synchronously after the Stripe API call).
+  //
+  // A charge can have multiple refund objects (multiple partial
+  // refunds against the same charge accumulate here). We iterate
+  // and process any that aren't yet recorded in our DB.
+  const paymentIntentId =
+    typeof charge.payment_intent === "string"
+      ? charge.payment_intent
+      : charge.payment_intent?.id;
+  if (!paymentIntentId) {
+    console.error(
+      `charge.refunded for charge ${charge.id} has no payment_intent; cannot link to invoice.`
+    );
+    return;
+  }
+  const invoice = await getInvoiceByStripePaymentIntent(paymentIntentId);
+  if (!invoice) {
+    console.error(
+      `charge.refunded for payment_intent ${paymentIntentId} has no matching invoice; ignoring.`
+    );
+    return;
+  }
+  const refundsList = charge.refunds?.data ?? [];
+  if (refundsList.length === 0) {
+    // Some charge.refunded events fire with the refunds list
+    // collapsed (the object includes the aggregated amount_refunded
+    // but the data array can be omitted depending on Stripe's
+    // expansion choices). In that case there's nothing for us to
+    // iterate over here; the actual `refund.created` /
+    // `refund.updated` events carry per-refund detail and we'd need
+    // to enable those in Stripe to handle them. For v1 we log and
+    // rely on the in-portal admin path (refundInvoice) being the
+    // only refund initiator.
+    console.log(
+      `charge.refunded for charge ${charge.id} arrived without refund objects in data; in-portal flow assumed.`
+    );
+    return;
+  }
+  for (const refund of refundsList) {
+    try {
+      // Idempotency: skip refunds we already recorded (either via
+      // portal admin action or a prior webhook delivery).
+      if (await isStripeRefundRecorded(refund.id)) {
+        continue;
+      }
+      const amountChf = (refund.amount ?? 0) / 100;
+      if (amountChf <= 0) continue;
+      // Map Stripe refund status to ours. Anything other than the
+      // canonical four falls through to 'pending' so we don't lose
+      // the record entirely.
+      let status: "pending" | "succeeded" | "failed" | "canceled" = "pending";
+      if (refund.status === "succeeded") status = "succeeded";
+      else if (refund.status === "failed") status = "failed";
+      else if (refund.status === "canceled") status = "canceled";
+      // For refunds that originated in Stripe Dashboard we don't
+      // have a reason to display. Use a sentinel string so the
+      // credit note PDF has something to print. Admin can edit
+      // post-hoc if needed (no UI for that today, but the DB row
+      // is reachable).
+      const reason = refund.reason
+        ? `Stripe Dashboard: ${refund.reason}`
+        : "Refund issued via Stripe Dashboard";
+      // refundInvoice with existingStripeRefund: don't call Stripe
+      // again (we'd error since the refund already exists), just
+      // mirror the record into our DB and issue the credit note.
+      await refundInvoice({
+        invoiceId: invoice.id,
+        amountChf,
+        reason,
+        refundedBy: "stripe-webhook",
+        existingStripeRefund: { id: refund.id, status },
+      });
+      console.log(
+        `Mirrored Stripe refund ${refund.id} for invoice ${invoice.invoiceNumber} (CHF ${amountChf.toFixed(2)}).`
+      );
+    } catch (e) {
+      if (e instanceof RefundNotAllowedError) {
+        // The invoice was already fully refunded by an earlier
+        // webhook delivery or by an in-portal action. That's fine.
+        console.log(
+          `Stripe refund ${refund.id}: ${e.message} (already accounted for).`
+        );
+        continue;
+      }
+      // For any other error, log but continue to the next refund —
+      // we don't want one bad refund to block the rest.
+      console.error(
+        `Failed to mirror Stripe refund ${refund.id} for invoice ${invoice.invoiceNumber}:`,
+        e
+      );
+    }
+  }
 }
 
 async function handlePaymentFailed(

src/components/admin/billing/custom-invoice-editor.tsx

@@ -0,0 +1,537 @@
+"use client";
+
+import { useState, useMemo, useCallback } from "react";
+import { useRouter } from "next/navigation";
+import { useTranslations } from "next-intl";
+import { Card, CardHeader } from "@/components/ui/card";
+import type {
+  CustomInvoiceDraftLine,
+  CustomInvoiceDraftPayload,
+  InvoiceDraftRecord,
+  OrgBilling,
+} from "@/types";
+
+interface Props {
+  draft: InvoiceDraftRecord;
+  orgBilling: OrgBilling | null;
+}
+
+const LOCALE_OPTIONS = [
+  { value: "de", label: "Deutsch" },
+  { value: "en", label: "English" },
+  { value: "fr", label: "Français" },
+  { value: "it", label: "Italiano" },
+];
+
+/**
+ * Custom invoice editor — Phase 8.
+ *
+ * Local state mirrors the persisted payload. Save persists the
+ * current state via PUT. Preview re-renders the PDF in-memory (no
+ * persistence). Issue allocates the invoice number and emails the
+ * customer.
+ *
+ * VAT preview is computed client-side from the country in the org
+ * billing snapshot — it's an estimate for the admin's eye, not
+ * authoritative. The server recomputes at issue time using the
+ * same vatRateForAddress() helper to ensure consistency.
+ *
+ * Discount/Rabatt is supported via a row with a negative
+ * unitPriceChf. The "Add discount" button seeds a new row with
+ * quantity 1 and a -50 placeholder to nudge the admin toward the
+ * intended sign.
+ */
+export function CustomInvoiceEditor({ draft, orgBilling }: Props) {
+  const t = useTranslations("adminBilling");
+  const router = useRouter();
+
+  // Editable state — initialized from the draft payload.
+  const [issueDate, setIssueDate] = useState(draft.payload.issueDate);
+  const [dueDate, setDueDate] = useState(draft.payload.dueDate);
+  const [locale, setLocale] = useState<"de" | "en" | "fr" | "it">(
+    draft.payload.locale
+  );
+  const [paymentMethod, setPaymentMethod] = useState<"invoice" | "card">(
+    draft.payload.paymentMethod
+  );
+  const [adminNotes, setAdminNotes] = useState(draft.payload.adminNotes ?? "");
+  const [lines, setLines] = useState<CustomInvoiceDraftLine[]>(
+    draft.payload.lines.length > 0
+      ? draft.payload.lines
+      : [{ description: "", quantity: 1, unitPriceChf: 0 }]
+  );
+
+  const [busy, setBusy] = useState<null | "save" | "preview" | "issue" | "delete">(
+    null
+  );
+  const [error, setError] = useState("");
+  const [dirty, setDirty] = useState(false);
+
+  // Build current payload — used by every action.
+  const buildPayload = useCallback((): CustomInvoiceDraftPayload => {
+    return {
+      issueDate,
+      dueDate,
+      locale,
+      paymentMethod,
+      adminNotes: adminNotes.trim() ? adminNotes.trim() : undefined,
+      lines: lines.map((ln) => ({
+        description: ln.description,
+        quantity: Number(ln.quantity) || 0,
+        unitPriceChf: Number(ln.unitPriceChf) || 0,
+      })),
+    };
+  }, [issueDate, dueDate, locale, paymentMethod, adminNotes, lines]);
+
+  // Client-side VAT estimate. The auth-of-truth math runs server-side
+  // at issue time; this is just to show the admin what they're about
+  // to commit to.
+  const totals = useMemo(() => {
+    const subtotal = Math.round(
+      lines.reduce(
+        (s, ln) => s + (Number(ln.quantity) || 0) * (Number(ln.unitPriceChf) || 0),
+        0
+      ) * 100
+    ) / 100;
+    // Country-based VAT estimate. Mirrors vatRateForAddress() —
+    // simplified because the editor doesn't know the platform
+    // pricing config. Defaults to 8.1 for CH/LI; 0 otherwise.
+    const country = (orgBilling?.country ?? "").toUpperCase();
+    let vatRate = 0;
+    if (country === "CH" || country === "LI") {
+      vatRate = 8.1;
+    } else if (orgBilling?.vatNumber) {
+      vatRate = 0; // reverse charge
+    } else {
+      vatRate = 0; // out of scope OR consumer (server will fix)
+    }
+    const vatAmount = Math.round(subtotal * (vatRate / 100) * 100) / 100;
+    const total = Math.round((subtotal + vatAmount) * 100) / 100;
+    return { subtotal, vatRate, vatAmount, total };
+  }, [lines, orgBilling]);
+
+  // Line management
+  const updateLine = (idx: number, patch: Partial<CustomInvoiceDraftLine>) => {
+    setLines((prev) =>
+      prev.map((ln, i) => (i === idx ? { ...ln, ...patch } : ln))
+    );
+    setDirty(true);
+  };
+  const addLine = () => {
+    setLines((prev) => [
+      ...prev,
+      { description: "", quantity: 1, unitPriceChf: 0 },
+    ]);
+    setDirty(true);
+  };
+  const addDiscountLine = () => {
+    setLines((prev) => [
+      ...prev,
+      { description: t("editorRabattDefaultDescription"), quantity: 1, unitPriceChf: -50 },
+    ]);
+    setDirty(true);
+  };
+  const removeLine = (idx: number) => {
+    setLines((prev) => prev.filter((_, i) => i !== idx));
+    setDirty(true);
+  };
+
+  // Actions
+  const save = async (): Promise<boolean> => {
+    setError("");
+    setBusy("save");
+    try {
+      const res = await fetch(
+        `/api/admin/billing/invoice-drafts/${draft.id}`,
+        {
+          method: "PUT",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify(buildPayload()),
+        }
+      );
+      const j = await res.json().catch(() => ({}));
+      if (!res.ok) throw new Error(j.error || `HTTP ${res.status}`);
+      setDirty(false);
+      return true;
+    } catch (e: any) {
+      setError(e.message);
+      return false;
+    } finally {
+      setBusy(null);
+    }
+  };
+
+  const preview = async () => {
+    // Save first if there are unsaved changes — otherwise the
+    // preview reflects stale data.
+    if (dirty) {
+      const ok = await save();
+      if (!ok) return;
+    }
+    // Open the preview in a new tab. The browser handles the PDF
+    // download/render natively; we don't need to fetch the bytes
+    // ourselves.
+    window.open(
+      `/api/admin/billing/invoice-drafts/${draft.id}/preview`,
+      "_blank",
+      "noopener"
+    );
+  };
+
+  const issue = async () => {
+    if (!confirm(t("editorIssueConfirm"))) return;
+    if (dirty) {
+      const ok = await save();
+      if (!ok) return;
+    }
+    setError("");
+    setBusy("issue");
+    try {
+      const res = await fetch(
+        `/api/admin/billing/invoice-drafts/${draft.id}/issue`,
+        { method: "POST" }
+      );
+      const j = await res.json().catch(() => ({}));
+      if (!res.ok) throw new Error(j.error || `HTTP ${res.status}`);
+      // The draft was deleted server-side; go look at the new invoice.
+      router.push(`/admin/billing/invoices/${j.invoice.id}`);
+    } catch (e: any) {
+      setError(e.message);
+      setBusy(null);
+    }
+  };
+
+  const deleteDraft = async () => {
+    if (!confirm(t("editorDeleteConfirm"))) return;
+    setError("");
+    setBusy("delete");
+    try {
+      const res = await fetch(
+        `/api/admin/billing/invoice-drafts/${draft.id}`,
+        { method: "DELETE" }
+      );
+      if (!res.ok) {
+        const j = await res.json().catch(() => ({}));
+        throw new Error(j.error || `HTTP ${res.status}`);
+      }
+      router.push("/admin/billing/invoice-drafts");
+    } catch (e: any) {
+      setError(e.message);
+      setBusy(null);
+    }
+  };
+
+  // No billing snapshot = can't issue. Save still works so admin
+  // can come back once the customer has completed onboarding.
+  const canIssue =
+    !!orgBilling &&
+    lines.length > 0 &&
+    lines.every((ln) => ln.description.trim().length > 0);
+
+  return (
+    <div className="flex flex-col gap-6">
+      {/* Bill-to preview — read-only, sourced from the org's billing
+          snapshot. Issued at issue time. */}
+      <Card>
+        <CardHeader>{t("editorBillToHeading")}</CardHeader>
+        <div className="p-4 text-sm">
+          {orgBilling ? (
+            <>
+              <p className="font-medium">{orgBilling.companyName}</p>
+              {orgBilling.contactName && (
+                <p className="text-text-secondary text-xs">
+                  {orgBilling.contactName}
+                </p>
+              )}
+              <p className="text-text-secondary text-xs">
+                {orgBilling.streetAddress}, {orgBilling.postalCode}{" "}
+                {orgBilling.city}, {orgBilling.country}
+              </p>
+              {orgBilling.vatNumber && (
+                <p className="text-text-muted text-xs mt-1">
+                  MWST/VAT: {orgBilling.vatNumber}
+                </p>
+              )}
+              <p className="text-text-muted text-xs">
+                {orgBilling.billingEmail}
+              </p>
+            </>
+          ) : (
+            <p className="text-error">{t("editorNoBillingSnapshot")}</p>
+          )}
+        </div>
+      </Card>
+
+      {/* Dates + locale + payment method */}
+      <Card>
+        <CardHeader>{t("editorMetadataHeading")}</CardHeader>
+        <div className="p-4 grid grid-cols-2 md:grid-cols-4 gap-4">
+          <div className="flex flex-col gap-1">
+            <label className="text-xs uppercase tracking-wider text-text-muted">
+              {t("editorIssueDateLabel")}
+            </label>
+            <input
+              type="date"
+              value={issueDate}
+              onChange={(e) => {
+                setIssueDate(e.target.value);
+                setDirty(true);
+              }}
+              className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+            />
+          </div>
+          <div className="flex flex-col gap-1">
+            <label className="text-xs uppercase tracking-wider text-text-muted">
+              {t("editorDueDateLabel")}
+            </label>
+            <input
+              type="date"
+              value={dueDate}
+              onChange={(e) => {
+                setDueDate(e.target.value);
+                setDirty(true);
+              }}
+              className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+            />
+          </div>
+          <div className="flex flex-col gap-1">
+            <label className="text-xs uppercase tracking-wider text-text-muted">
+              {t("editorLocaleLabel")}
+            </label>
+            <select
+              value={locale}
+              onChange={(e) => {
+                setLocale(e.target.value as "de" | "en" | "fr" | "it");
+                setDirty(true);
+              }}
+              className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+            >
+              {LOCALE_OPTIONS.map((o) => (
+                <option key={o.value} value={o.value}>
+                  {o.label}
+                </option>
+              ))}
+            </select>
+          </div>
+          <div className="flex flex-col gap-1">
+            <label className="text-xs uppercase tracking-wider text-text-muted">
+              {t("editorPaymentMethodLabel")}
+            </label>
+            <select
+              value={paymentMethod}
+              onChange={(e) => {
+                setPaymentMethod(e.target.value as "invoice" | "card");
+                setDirty(true);
+              }}
+              className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+            >
+              <option value="invoice">{t("editorPaymentInvoice")}</option>
+              <option value="card">{t("editorPaymentCard")}</option>
+            </select>
+          </div>
+        </div>
+      </Card>
+
+      {/* Line editor */}
+      <Card>
+        <CardHeader>{t("editorLinesHeading")}</CardHeader>
+        <div className="p-4">
+          <table className="w-full text-sm">
+            <thead className="text-xs text-text-muted text-left">
+              <tr>
+                <th className="pb-2 pr-3">{t("editorLineDescription")}</th>
+                <th className="pb-2 pr-3 w-20 text-right">
+                  {t("editorLineQty")}
+                </th>
+                <th className="pb-2 pr-3 w-32 text-right">
+                  {t("editorLineUnitPrice")}
+                </th>
+                <th className="pb-2 pr-3 w-32 text-right">
+                  {t("editorLineAmount")}
+                </th>
+                <th className="pb-2 w-12"></th>
+              </tr>
+            </thead>
+            <tbody>
+              {lines.map((ln, idx) => {
+                const amount =
+                  Math.round(
+                    (Number(ln.quantity) || 0) *
+                      (Number(ln.unitPriceChf) || 0) *
+                      100
+                  ) / 100;
+                return (
+                  <tr key={idx} className="border-t border-border">
+                    <td className="py-2 pr-3">
+                      <input
+                        type="text"
+                        value={ln.description}
+                        onChange={(e) =>
+                          updateLine(idx, { description: e.target.value })
+                        }
+                        placeholder={t("editorLineDescriptionPlaceholder")}
+                        className="w-full px-2 py-1.5 rounded border border-border bg-surface-2 text-sm"
+                        maxLength={500}
+                      />
+                    </td>
+                    <td className="py-2 pr-3">
+                      <input
+                        type="number"
+                        step="0.01"
+                        value={ln.quantity}
+                        onChange={(e) =>
+                          updateLine(idx, {
+                            quantity: parseFloat(e.target.value) || 0,
+                          })
+                        }
+                        className="w-full px-2 py-1.5 rounded border border-border bg-surface-2 text-sm font-mono text-right"
+                      />
+                    </td>
+                    <td className="py-2 pr-3">
+                      <input
+                        type="number"
+                        step="0.01"
+                        value={ln.unitPriceChf}
+                        onChange={(e) =>
+                          updateLine(idx, {
+                            unitPriceChf: parseFloat(e.target.value) || 0,
+                          })
+                        }
+                        className="w-full px-2 py-1.5 rounded border border-border bg-surface-2 text-sm font-mono text-right"
+                      />
+                    </td>
+                    <td className="py-2 pr-3 text-right font-mono text-sm whitespace-nowrap">
+                      <span className={amount < 0 ? "text-error" : ""}>
+                        CHF {amount.toFixed(2)}
+                      </span>
+                    </td>
+                    <td className="py-2 text-right">
+                      <button
+                        onClick={() => removeLine(idx)}
+                        className="text-text-muted hover:text-error text-lg leading-none"
+                        title={t("editorLineRemove")}
+                        type="button"
+                      >
+                        ×
+                      </button>
+                    </td>
+                  </tr>
+                );
+              })}
+            </tbody>
+          </table>
+          <div className="flex gap-2 mt-3">
+            <button
+              onClick={addLine}
+              type="button"
+              className="px-3 py-1.5 rounded-md border border-border text-sm hover:bg-surface-3"
+            >
+              + {t("editorAddLine")}
+            </button>
+            <button
+              onClick={addDiscountLine}
+              type="button"
+              className="px-3 py-1.5 rounded-md border border-border text-sm hover:bg-surface-3 text-text-secondary"
+              title={t("editorAddDiscountHint")}
+            >
+              − {t("editorAddDiscount")}
+            </button>
+          </div>
+        </div>
+      </Card>
+
+      {/* Admin notes */}
+      <Card>
+        <CardHeader>{t("editorNotesHeading")}</CardHeader>
+        <div className="p-4">
+          <textarea
+            value={adminNotes}
+            onChange={(e) => {
+              setAdminNotes(e.target.value);
+              setDirty(true);
+            }}
+            placeholder={t("editorNotesPlaceholder")}
+            rows={2}
+            maxLength={2000}
+            className="w-full px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+          />
+          <p className="text-xs text-text-muted mt-1">
+            {t("editorNotesHint")}
+          </p>
+        </div>
+      </Card>
+
+      {/* Totals preview */}
+      <Card>
+        <CardHeader>{t("editorTotalsHeading")}</CardHeader>
+        <div className="p-4 max-w-sm ml-auto text-sm">
+          <div className="flex justify-between py-1">
+            <span className="text-text-muted">{t("editorSubtotal")}</span>
+            <span className="font-mono">CHF {totals.subtotal.toFixed(2)}</span>
+          </div>
+          <div className="flex justify-between py-1">
+            <span className="text-text-muted">
+              {t("editorVat")} ({totals.vatRate.toFixed(1)}%)
+            </span>
+            <span className="font-mono">CHF {totals.vatAmount.toFixed(2)}</span>
+          </div>
+          <div className="flex justify-between py-2 border-t border-border mt-1 font-medium">
+            <span>{t("editorTotal")}</span>
+            <span className="font-mono">CHF {totals.total.toFixed(2)}</span>
+          </div>
+          <p className="text-xs text-text-muted mt-2 italic">
+            {t("editorTotalsEstimateNote")}
+          </p>
+        </div>
+      </Card>
+
+      {/* Error + actions */}
+      {error && (
+        <div className="text-sm text-error border border-error/30 bg-error/10 rounded-md px-4 py-2">
+          {error}
+        </div>
+      )}
+
+      <div className="flex flex-wrap gap-2 justify-between items-center">
+        <button
+          onClick={deleteDraft}
+          disabled={busy !== null}
+          className="px-4 py-2 rounded-md border border-error text-error text-sm disabled:opacity-50 hover:bg-error/10"
+          type="button"
+        >
+          {busy === "delete" ? t("deleting") : t("editorDeleteBtn")}
+        </button>
+        <div className="flex gap-2 ml-auto">
+          <button
+            onClick={save}
+            disabled={busy !== null || !dirty}
+            className="px-4 py-2 rounded-md border border-border text-sm disabled:opacity-50"
+            type="button"
+          >
+            {busy === "save"
+              ? t("saving")
+              : dirty
+                ? t("editorSaveBtn")
+                : t("editorSavedBtn")}
+          </button>
+          <button
+            onClick={preview}
+            disabled={busy !== null || lines.length === 0}
+            className="px-4 py-2 rounded-md border border-border text-sm disabled:opacity-50"
+            type="button"
+          >
+            {busy === "preview" ? t("previewing") : t("editorPreviewBtn")}
+          </button>
+          <button
+            onClick={issue}
+            disabled={busy !== null || !canIssue}
+            className="px-4 py-2 rounded-md bg-accent text-white text-sm disabled:opacity-50"
+            type="button"
+          >
+            {busy === "issue" ? t("issuing") : t("editorIssueBtn")}
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/admin/billing/draft-list.tsx

@@ -0,0 +1,145 @@
+"use client";
+
+import { useState } from "react";
+import Link from "next/link";
+import { useRouter } from "next/navigation";
+import { useTranslations, useFormatter } from "next-intl";
+import { Card } from "@/components/ui/card";
+import type { InvoiceDraftRecord } from "@/types";
+
+interface Props {
+  drafts: InvoiceDraftRecord[];
+  /** Map ZITADEL org id → company name for friendlier display. */
+  orgNameMap: Record<string, string>;
+}
+
+/**
+ * Renders the drafts table with per-row Edit / Delete actions.
+ *
+ * The total preview is the algebraic sum of line amounts (the same
+ * formula billing.computeCustomInvoiceTotals uses for the subtotal,
+ * minus VAT — which we don't know without the org's billing
+ * snapshot). It's a hint, not authoritative; the real total
+ * appears when the draft is issued.
+ *
+ * Empty state shows a clear CTA so a fresh admin knows where to
+ * start.
+ */
+export function DraftList({ drafts, orgNameMap }: Props) {
+  const t = useTranslations("adminBilling");
+  const fmt = useFormatter();
+  const router = useRouter();
+  const [busyId, setBusyId] = useState<string | null>(null);
+
+  const onDelete = async (id: string) => {
+    if (!confirm(t("draftDeleteConfirm"))) return;
+    setBusyId(id);
+    try {
+      const res = await fetch(`/api/admin/billing/invoice-drafts/${id}`, {
+        method: "DELETE",
+      });
+      if (!res.ok) {
+        const j = await res.json().catch(() => ({}));
+        throw new Error(j.error || `HTTP ${res.status}`);
+      }
+      router.refresh();
+    } catch (e: any) {
+      alert(e.message);
+    } finally {
+      setBusyId(null);
+    }
+  };
+
+  if (drafts.length === 0) {
+    return (
+      <Card>
+        <div className="p-6 text-center">
+          <p className="text-text-secondary mb-4">{t("draftsEmpty")}</p>
+          <Link
+            href="/admin/billing/invoices/new"
+            className="inline-block px-4 py-2 rounded-md bg-accent text-white text-sm"
+          >
+            {t("newInvoiceBtn")}
+          </Link>
+        </div>
+      </Card>
+    );
+  }
+
+  return (
+    <Card>
+      <div className="flex justify-end p-3 border-b border-border">
+        <Link
+          href="/admin/billing/invoices/new"
+          className="inline-block px-3 py-1.5 rounded-md bg-accent text-white text-sm"
+        >
+          {t("newInvoiceBtn")}
+        </Link>
+      </div>
+      <table className="w-full text-sm">
+        <thead className="text-xs text-text-muted text-left">
+          <tr>
+            <th className="pb-2 pl-3 pr-4">{t("draftOrgCol")}</th>
+            <th className="pb-2 pr-4">{t("draftIssueDateCol")}</th>
+            <th className="pb-2 pr-4 text-center">{t("draftLinesCol")}</th>
+            <th className="pb-2 pr-4 text-right">{t("draftSubtotalCol")}</th>
+            <th className="pb-2 pr-4">{t("draftUpdatedCol")}</th>
+            <th className="pb-2 pr-3 text-right">{t("draftActionsCol")}</th>
+          </tr>
+        </thead>
+        <tbody>
+          {drafts.map((d) => {
+            const subtotal = d.payload.lines.reduce(
+              (s, ln) =>
+                s +
+                Math.round(ln.quantity * ln.unitPriceChf * 100) / 100,
+              0
+            );
+            return (
+              <tr key={d.id} className="border-t border-border">
+                <td className="py-2 pl-3 pr-4">
+                  <Link
+                    href={`/admin/billing/invoice-drafts/${d.id}`}
+                    className="hover:underline"
+                  >
+                    {orgNameMap[d.zitadelOrgId] ?? d.zitadelOrgId}
+                  </Link>
+                </td>
+                <td className="py-2 pr-4 text-xs font-mono text-text-secondary whitespace-nowrap">
+                  {d.payload.issueDate}
+                </td>
+                <td className="py-2 pr-4 text-center text-xs">
+                  {d.payload.lines.length}
+                </td>
+                <td className="py-2 pr-4 text-right font-mono text-xs whitespace-nowrap">
+                  CHF {subtotal.toFixed(2)}
+                </td>
+                <td className="py-2 pr-4 text-xs text-text-muted whitespace-nowrap">
+                  {fmt.dateTime(new Date(d.updatedAt), {
+                    dateStyle: "medium",
+                    timeStyle: "short",
+                  })}
+                </td>
+                <td className="py-2 pr-3 text-right">
+                  <Link
+                    href={`/admin/billing/invoice-drafts/${d.id}`}
+                    className="text-accent hover:underline text-xs mr-3"
+                  >
+                    {t("editBtn")}
+                  </Link>
+                  <button
+                    onClick={() => onDelete(d.id)}
+                    disabled={busyId === d.id}
+                    className="text-error hover:underline text-xs disabled:opacity-50"
+                  >
+                    {busyId === d.id ? t("deleting") : t("deleteBtn")}
+                  </button>
+                </td>
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </Card>
+  );
+}

src/components/admin/billing/invoice-detail-view.tsx

@@ -4,33 +4,61 @@ import { useState, Fragment } from "react";
 import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { Card, CardHeader } from "@/components/ui/card";
-import type { InvoiceDetail, InvoiceStatus } from "@/types";
+import type { CreditNote, InvoiceDetail, InvoiceStatus } from "@/types";
 
 interface Props {
   detail: InvoiceDetail;
+  /**
+   * Phase 7: credit notes linked to this invoice (voids + refunds).
+   * Empty array when none. Passed from the server page; client
+   * doesn't re-fetch — router.refresh() rebuilds after actions.
+   */
+  creditNotes?: CreditNote[];
 }
 
 /**
  * Renders the invoice header (status, totals, action bar) then
  * line items grouped by tenant, then billing snapshot. Actions are
- * mark-paid (POST), delete (DELETE), PDF download (link to /pdf).
+ * mark-paid (POST), void (POST), refund (POST), delete (DELETE),
+ * PDF download (link to /pdf).
+ *
+ * Phase 7 adds void + refund. The action bar shows:
+ *   - status open/overdue → Mark paid, Void, Delete
+ *   - status paid          → Refund, Delete
+ *   - status partially_refunded → Refund (for remainder), Delete
+ *   - status fully_refunded / void → Delete only (read-only otherwise)
  *
  * On successful action we router.refresh() — the server-side page
- * re-renders against the new DB state. For delete we navigate
- * away first.
+ * re-renders against the new DB state, including any new credit
+ * notes.
  */
-export function InvoiceDetailView({ detail }: Props) {
+export function InvoiceDetailView({ detail, creditNotes = [] }: Props) {
   const t = useTranslations("adminBilling");
   const router = useRouter();
   const { invoice, lines } = detail;
 
-  const [busyAction, setBusyAction] = useState<null | "mark-paid" | "delete">(
-    null
-  );
+  const [busyAction, setBusyAction] = useState<
+    null | "mark-paid" | "delete" | "void" | "refund"
+  >(null);
   const [actionError, setActionError] = useState("");
   const [noteInput, setNoteInput] = useState("");
   const [noteOpen, setNoteOpen] = useState(false);
 
+  // Phase 7 — void modal state
+  const [voidOpen, setVoidOpen] = useState(false);
+  const [voidReason, setVoidReason] = useState("");
+
+  // Phase 7 — refund modal state. Amount defaults to the full
+  // remaining refundable on open.
+  const [refundOpen, setRefundOpen] = useState(false);
+  const [refundAmount, setRefundAmount] = useState("");
+  const [refundReason, setRefundReason] = useState("");
+
+  const remainingRefundable =
+    Math.round(
+      (invoice.totalChf - invoice.refundedTotalChf) * 100
+    ) / 100;
+
   const markPaid = async () => {
     setActionError("");
     setBusyAction("mark-paid");
@@ -75,6 +103,84 @@ export function InvoiceDetailView({ detail }: Props) {
     }
   };
 
+  // Phase 7 — void: marks an unpaid invoice as cancelled and issues
+  // a credit note. Backend rejects if the invoice is paid (use
+  // refund) or already voided/refunded.
+  const voidInvoice = async () => {
+    if (!voidReason.trim()) {
+      setActionError(t("voidReasonRequired"));
+      return;
+    }
+    setActionError("");
+    setBusyAction("void");
+    try {
+      const res = await fetch(
+        `/api/admin/billing/invoices/${invoice.id}/void`,
+        {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ reason: voidReason }),
+        }
+      );
+      const j = await res.json().catch(() => ({}));
+      if (!res.ok) throw new Error(j.error || `HTTP ${res.status}`);
+      setVoidOpen(false);
+      setVoidReason("");
+      router.refresh();
+    } catch (e: any) {
+      setActionError(e.message);
+    } finally {
+      setBusyAction(null);
+    }
+  };
+
+  // Phase 7 — refund: paid invoices only. Amount may be partial;
+  // backend caps at remaining refundable.
+  const refundInvoice = async () => {
+    const amt = parseFloat(refundAmount);
+    if (!isFinite(amt) || amt <= 0) {
+      setActionError(t("refundAmountInvalid"));
+      return;
+    }
+    if (amt - remainingRefundable > 0.005) {
+      setActionError(
+        t("refundAmountExceeds", {
+          max: remainingRefundable.toFixed(2),
+        })
+      );
+      return;
+    }
+    if (!refundReason.trim()) {
+      setActionError(t("refundReasonRequired"));
+      return;
+    }
+    setActionError("");
+    setBusyAction("refund");
+    try {
+      const res = await fetch(
+        `/api/admin/billing/invoices/${invoice.id}/refund`,
+        {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({
+            amountChf: Math.round(amt * 100) / 100,
+            reason: refundReason,
+          }),
+        }
+      );
+      const j = await res.json().catch(() => ({}));
+      if (!res.ok) throw new Error(j.error || `HTTP ${res.status}`);
+      setRefundOpen(false);
+      setRefundAmount("");
+      setRefundReason("");
+      router.refresh();
+    } catch (e: any) {
+      setActionError(e.message);
+    } finally {
+      setBusyAction(null);
+    }
+  };
+
   // Group lines by tenant for display (matches PDF layout).
   const linesByTenant = new Map<string | null, typeof lines>();
   for (const ln of lines) {
@@ -97,10 +203,14 @@ export function InvoiceDetailView({ detail }: Props) {
           </h1>
           <div className="flex items-center gap-3 mt-3 text-sm">
             <StatusPill status={invoice.status} />
-            <span className="text-text-muted">
-              {invoice.periodStart} → {invoice.periodEnd}
-            </span>
-            <span className="text-text-muted">·</span>
+            {invoice.periodStart && invoice.periodEnd && (
+              <>
+                <span className="text-text-muted">
+                  {invoice.periodStart} → {invoice.periodEnd}
+                </span>
+                <span className="text-text-muted">·</span>
+              </>
+            )}
             <span className="text-text-muted">
               {t("dueOnLabel")}: {invoice.dueAt}
             </span>
@@ -171,6 +281,144 @@ export function InvoiceDetailView({ detail }: Props) {
               )}
             </>
           )}
+          {/* Phase 7 — Void: visible only for open/overdue invoices.
+              Same gating as Mark Paid but mutually exclusive with it
+              via the chosen action. Opens a small inline form so
+              the admin can enter a reason; reason is required and
+              lands on the credit-note PDF. */}
+          {(invoice.status === "open" || invoice.status === "overdue") && (
+            <>
+              {!voidOpen ? (
+                <button
+                  onClick={() => {
+                    setVoidOpen(true);
+                    setNoteOpen(false);
+                    setRefundOpen(false);
+                  }}
+                  disabled={busyAction !== null}
+                  className="px-4 py-2 rounded-md border border-error text-error text-sm disabled:opacity-50 hover:bg-error/10"
+                >
+                  {t("voidBtn")}
+                </button>
+              ) : (
+                <div className="flex items-center gap-2 flex-grow">
+                  <input
+                    type="text"
+                    placeholder={t("voidReasonPlaceholder")}
+                    value={voidReason}
+                    onChange={(e) => setVoidReason(e.target.value)}
+                    maxLength={500}
+                    className="flex-grow px-3 py-1.5 rounded-md border border-border bg-surface-2 text-sm"
+                    autoFocus
+                  />
+                  <button
+                    onClick={voidInvoice}
+                    disabled={busyAction !== null}
+                    className="px-3 py-1.5 rounded-md bg-error text-white text-sm disabled:opacity-50"
+                  >
+                    {busyAction === "void" ? t("saving") : t("confirmVoid")}
+                  </button>
+                  <button
+                    onClick={() => {
+                      setVoidOpen(false);
+                      setVoidReason("");
+                    }}
+                    className="px-3 py-1.5 rounded-md border border-border text-sm"
+                  >
+                    {t("cancel")}
+                  </button>
+                </div>
+              )}
+            </>
+          )}
+          {/* Phase 7 — Refund: paid invoices, including ones already
+              partially refunded (as long as some refundable amount
+              remains). Opens an inline form with amount + reason.
+              The remaining-refundable hint helps admin pick the
+              right number. */}
+          {(invoice.status === "paid" ||
+            invoice.status === "partially_refunded") &&
+            remainingRefundable > 0 && (
+              <>
+                {!refundOpen ? (
+                  <button
+                    onClick={() => {
+                      setRefundOpen(true);
+                      setNoteOpen(false);
+                      setVoidOpen(false);
+                      setRefundAmount(remainingRefundable.toFixed(2));
+                    }}
+                    disabled={busyAction !== null}
+                    className="px-4 py-2 rounded-md border border-error text-error text-sm disabled:opacity-50 hover:bg-error/10"
+                  >
+                    {t("refundBtn")}
+                  </button>
+                ) : (
+                  <div className="flex flex-col gap-2 flex-grow">
+                    <div className="text-xs text-text-muted">
+                      {t("refundRemainingHint", {
+                        max: remainingRefundable.toFixed(2),
+                      })}
+                    </div>
+                    <div className="flex items-center gap-4 flex-wrap">
+                      <div className="flex flex-col gap-1">
+                        <label className="text-[10px] uppercase tracking-wider text-text-muted">
+                          {t("refundAmountLabel")}
+                        </label>
+                        <input
+                          type="number"
+                          step="0.01"
+                          min="0.01"
+                          max={remainingRefundable}
+                          placeholder="CHF"
+                          value={refundAmount}
+                          onChange={(e) => setRefundAmount(e.target.value)}
+                          className="w-32 px-3 py-1.5 rounded-md border border-border bg-surface-2 text-sm font-mono"
+                          autoFocus
+                        />
+                        <span className="text-[10px] text-text-muted italic">
+                          {t("refundAmountInclVatHint")}
+                        </span>
+                      </div>
+                      <div className="flex flex-col gap-1 flex-grow min-w-[200px]">
+                        <label className="text-[10px] uppercase tracking-wider text-text-muted">
+                          {t("refundReasonLabel")}
+                        </label>
+                        <input
+                          type="text"
+                          placeholder={t("refundReasonPlaceholder")}
+                          value={refundReason}
+                          onChange={(e) => setRefundReason(e.target.value)}
+                          maxLength={500}
+                          className="w-full px-3 py-1.5 rounded-md border border-border bg-surface-2 text-sm"
+                        />
+                      </div>
+                      <div className="flex items-center gap-2 self-end">
+                        <button
+                          onClick={refundInvoice}
+                          disabled={busyAction !== null}
+                          className="px-3 py-1.5 rounded-md bg-error text-white text-sm disabled:opacity-50"
+                        >
+                          {busyAction === "refund"
+                            ? t("saving")
+                            : t("confirmRefund")}
+                        </button>
+                        <button
+                          onClick={() => {
+                            setRefundOpen(false);
+                            setRefundAmount("");
+                            setRefundReason("");
+                          }}
+                          className="px-3 py-1.5 rounded-md border border-border text-sm"
+                        >
+                          {t("cancel")}
+                        </button>
+                      </div>
+                    </div>
+                  </div>
+                )}
+              </>
+            )}
           <button
             onClick={deleteInvoice}
             disabled={busyAction !== null}
@@ -189,8 +437,90 @@ export function InvoiceDetailView({ detail }: Props) {
             {invoice.paidMethodDetail}
           </div>
         )}
+        {/* Phase 7 — void/refund summary lines, shown when applicable.
+            Surfaces the auditing context that the columns alone don't
+            (who voided, what the reason was, how much has been
+            refunded vs how much remains). */}
+        {invoice.voidedAt && (
+          <div className="mt-3 text-xs text-text-muted">
+            {t("voidedOnLabel")}: {invoice.voidedAt} · {invoice.voidedBy}
+            {invoice.voidReason ? ` · ${invoice.voidReason}` : ""}
+          </div>
+        )}
+        {invoice.refundedTotalChf > 0 && (
+          <div className="mt-3 text-xs text-text-muted">
+            {t("refundedTotalLabel")}: CHF{" "}
+            {invoice.refundedTotalChf.toFixed(2)} ·{" "}
+            {t("refundedRemainingLabel")}: CHF{" "}
+            {remainingRefundable.toFixed(2)}
+          </div>
+        )}
       </Card>
 
+      {/* Phase 7 — linked credit notes panel. Hidden when there are
+          none (most invoices). When present, lists each credit note
+          with kind, amount, reason, issued date, and PDF download. */}
+      {creditNotes.length > 0 && (
+        <Card>
+          <CardHeader>{t("creditNotesPanelTitle")}</CardHeader>
+          <table className="w-full text-sm">
+            <thead className="text-xs text-text-muted text-left">
+              <tr>
+                <th className="pb-2 pr-4">{t("creditNoteNumberHeader")}</th>
+                <th className="pb-2 pr-4">{t("creditNoteKindHeader")}</th>
+                <th className="pb-2 pr-4 text-right">
+                  {t("creditNoteAmountHeader")}
+                </th>
+                <th className="pb-2 pr-4">{t("creditNoteReasonHeader")}</th>
+                <th className="pb-2 pr-4">{t("creditNoteIssuedHeader")}</th>
+                <th className="pb-2 text-right">{t("creditNotePdfHeader")}</th>
+              </tr>
+            </thead>
+            <tbody>
+              {creditNotes.map((cn) => (
+                <tr key={cn.id} className="border-t border-border">
+                  <td className="py-2 pr-4 font-mono text-xs">
+                    {cn.creditNoteNumber}
+                  </td>
+                  <td className="py-2 pr-4">
+                    <span className="px-2 py-0.5 rounded text-xs text-error bg-error/10">
+                      {t(`creditNoteKind_${cn.kind}` as any)}
+                    </span>
+                  </td>
+                  <td className="py-2 pr-4 text-right font-mono whitespace-nowrap">
+                    CHF {cn.amountChf.toFixed(2)}
+                  </td>
+                  <td className="py-2 pr-4 text-text-secondary text-xs">
+                    {cn.reason ?? "—"}
+                  </td>
+                  <td className="py-2 pr-4 text-xs text-text-muted whitespace-nowrap">
+                    {cn.issuedAt.slice(0, 10)}
+                  </td>
+                  <td className="py-2 text-right">
+                    {cn.hasPdf ? (
+                      <a
+                        href={`/api/credit-notes/${encodeURIComponent(
+                          cn.creditNoteNumber
+                        )}/pdf`}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        className="text-accent hover:underline text-xs"
+                      >
+                        {t("downloadPdfBtn")}
+                      </a>
+                    ) : (
+                      <span className="text-text-muted text-xs italic">
+                        {t("creditNoteNoPdf")}
+                      </span>
+                    )}
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </Card>
+      )}
+
       {/* Lines */}
       <Card>
         <CardHeader>{t("lineItemsTitle")}</CardHeader>
@@ -296,7 +626,9 @@ function StatusPill({ status }: { status: InvoiceStatus }) {
         ? "bg-error/15 text-error"
         : status === "void" || status === "uncollectible"
           ? "bg-text-muted/15 text-text-muted"
-          : "bg-accent/15 text-accent";
+          : status === "partially_refunded" || status === "fully_refunded"
+            ? "bg-error/15 text-error"
+            : "bg-accent/15 text-accent";
   return (
     <span
       className={`inline-block px-2 py-0.5 rounded text-xs font-medium ${color}`}

src/components/admin/billing/invoices-table.tsx

@@ -100,6 +100,23 @@ export function InvoicesTable({ initialInvoices }: Props) {
               {t("loading")}
             </span>
           )}
+          {/* Phase 8: shortcuts to the custom-invoice flow. The
+              Drafts link is muted because most of the time it's
+              empty; New invoice is the prominent CTA. */}
+          <div className={`flex items-center gap-3 ${busy ? "" : "ml-auto"}`}>
+            <Link
+              href="/admin/billing/invoice-drafts"
+              className="text-xs text-text-muted hover:underline"
+            >
+              {t("draftsLink")}
+            </Link>
+            <Link
+              href="/admin/billing/invoices/new"
+              className="px-3 py-1.5 rounded-md bg-accent text-white text-sm"
+            >
+              + {t("newInvoiceBtn")}
+            </Link>
+          </div>
         </div>
       </Card>
 
@@ -142,7 +159,11 @@ export function InvoicesTable({ initialInvoices }: Props) {
                     </div>
                   </td>
                   <td className="py-2 text-xs font-mono">
-                    {inv.periodStart.slice(0, 7)}
+                    {inv.periodStart
+                      ? inv.periodStart.slice(0, 7)
+                      : inv.source === "custom"
+                        ? "—"
+                        : ""}
                   </td>
                   <td className="py-2">
                     <StatusPill status={inv.status} />

src/components/admin/billing/new-invoice-form.tsx

@@ -0,0 +1,166 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { useTranslations } from "next-intl";
+import { Card } from "@/components/ui/card";
+
+interface OrgEntry {
+  zitadelOrgId: string;
+  companyName: string | null;
+  country: string | null;
+  hasBillingAddress: boolean;
+}
+
+interface Props {
+  orgs: OrgEntry[];
+}
+
+const LOCALE_OPTIONS = [
+  { value: "de", label: "Deutsch" },
+  { value: "en", label: "English" },
+  { value: "fr", label: "Français" },
+  { value: "it", label: "Italiano" },
+];
+
+/**
+ * Step 1 of the custom-invoice flow: pick an org. Creating the
+ * draft on the backend allocates an id we redirect to; the editor
+ * page then loads the draft and lets the admin add lines.
+ *
+ * The dropdown shows the company name when known, falling back to
+ * the raw org id. Orgs without a billing snapshot are visually
+ * marked and warn the admin — they can still create the draft but
+ * won't be able to issue until billing info is set.
+ *
+ * Default issue date = today; due date = today + 30 days. These
+ * are sensible defaults the editor can override.
+ */
+export function NewInvoiceForm({ orgs }: Props) {
+  const t = useTranslations("adminBilling");
+  const router = useRouter();
+  const [orgId, setOrgId] = useState(
+    orgs.find((o) => o.hasBillingAddress)?.zitadelOrgId ??
+      orgs[0]?.zitadelOrgId ??
+      ""
+  );
+  const [locale, setLocale] = useState<"de" | "en" | "fr" | "it">("de");
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState("");
+
+  const selected = orgs.find((o) => o.zitadelOrgId === orgId);
+
+  // Pick a locale default from the org's country if admin hasn't
+  // overridden — same heuristic the auto cron uses.
+  const onOrgChange = (newOrgId: string) => {
+    setOrgId(newOrgId);
+    const o = orgs.find((x) => x.zitadelOrgId === newOrgId);
+    const c = (o?.country ?? "").toUpperCase();
+    if (["CH", "LI", "AT", "DE"].includes(c)) setLocale("de");
+    else if (["FR", "BE", "LU"].includes(c)) setLocale("fr");
+    else if (c === "IT") setLocale("it");
+    else setLocale("en");
+  };
+
+  const onSubmit = async () => {
+    if (!orgId) {
+      setError(t("newInvoiceOrgRequired"));
+      return;
+    }
+    setError("");
+    setBusy(true);
+    try {
+      const today = new Date().toISOString().slice(0, 10);
+      const due = new Date();
+      due.setDate(due.getDate() + 30);
+      const dueIso = due.toISOString().slice(0, 10);
+      const res = await fetch("/api/admin/billing/invoice-drafts", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          zitadelOrgId: orgId,
+          payload: {
+            issueDate: today,
+            dueDate: dueIso,
+            locale,
+            paymentMethod: "invoice",
+            lines: [],
+          },
+        }),
+      });
+      const j = await res.json().catch(() => ({}));
+      if (!res.ok) throw new Error(j.error || `HTTP ${res.status}`);
+      router.push(`/admin/billing/invoice-drafts/${j.draft.id}`);
+    } catch (e: any) {
+      setError(e.message);
+      setBusy(false);
+    }
+  };
+
+  return (
+    <Card>
+      <div className="p-5 flex flex-col gap-4">
+        <div className="flex flex-col gap-1">
+          <label className="text-xs uppercase tracking-wider text-text-muted">
+            {t("newInvoiceOrgLabel")}
+          </label>
+          <select
+            value={orgId}
+            onChange={(e) => onOrgChange(e.target.value)}
+            className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+          >
+            <option value="">{t("newInvoiceOrgPlaceholder")}</option>
+            {orgs.map((o) => (
+              <option
+                key={o.zitadelOrgId}
+                value={o.zitadelOrgId}
+                disabled={!o.hasBillingAddress}
+              >
+                {o.companyName ?? o.zitadelOrgId}
+                {!o.hasBillingAddress
+                  ? ` (${t("newInvoiceOrgNoBilling")})`
+                  : ""}
+              </option>
+            ))}
+          </select>
+          {selected && !selected.hasBillingAddress && (
+            <p className="text-xs text-error mt-1">
+              {t("newInvoiceOrgBillingMissing")}
+            </p>
+          )}
+        </div>
+
+        <div className="flex flex-col gap-1">
+          <label className="text-xs uppercase tracking-wider text-text-muted">
+            {t("newInvoiceLocaleLabel")}
+          </label>
+          <select
+            value={locale}
+            onChange={(e) =>
+              setLocale(e.target.value as "de" | "en" | "fr" | "it")
+            }
+            className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
+          >
+            {LOCALE_OPTIONS.map((o) => (
+              <option key={o.value} value={o.value}>
+                {o.label}
+              </option>
+            ))}
+          </select>
+        </div>
+
+        {error && <div className="text-sm text-error">{error}</div>}
+
+        <div className="flex justify-end gap-2 pt-2">
+          <button
+            onClick={onSubmit}
+            disabled={busy || !orgId || !selected?.hasBillingAddress}
+            className="px-4 py-2 rounded-md bg-accent text-white text-sm disabled:opacity-50"
+          >
+            {busy ? t("creating") : t("newInvoiceContinueBtn")}
+          </button>
+        </div>
+      </div>
+    </Card>
+  );
+}

src/components/billing/customer-credit-note-list.tsx

@@ -0,0 +1,101 @@
+import { useTranslations, useFormatter } from "next-intl";
+import { Card } from "@/components/ui/card";
+import type { CreditNote } from "@/types";
+
+interface Props {
+  creditNotes: CreditNote[];
+}
+
+const kindColors: Record<string, string> = {
+  // Voids = the invoice was cancelled; gentle red.
+  void: "text-error bg-error/10",
+  // Refunds = money returned; also red but slightly differentiated.
+  refund: "text-error bg-error/10",
+};
+
+/**
+ * Phase 7 — customer's credit-note history below the invoice list.
+ *
+ * Hidden entirely when the org has zero credit notes (most orgs in
+ * normal operation). When present, each row shows the credit-note
+ * number, the invoice it relates to, kind (void / refund), amount,
+ * and a download link to the PDF.
+ *
+ * No detail page — clicking the PDF link opens the document inline
+ * (browser PDF viewer), which IS the credit-note detail view. A
+ * separate per-credit-note web page would duplicate what's in the
+ * PDF and add no value.
+ */
+export function CustomerCreditNoteList({ creditNotes }: Props) {
+  const t = useTranslations("customerBilling");
+  const fmt = useFormatter();
+
+  if (creditNotes.length === 0) {
+    return null;
+  }
+
+  return (
+    <Card>
+      <table className="w-full text-sm">
+        <thead className="text-xs text-text-muted text-left">
+          <tr>
+            <th className="pb-2 pr-4">{t("creditNoteNumberCol")}</th>
+            <th className="pb-2 pr-4">{t("creditNoteInvoiceCol")}</th>
+            <th className="pb-2 pr-4">{t("creditNoteIssuedCol")}</th>
+            <th className="pb-2 pr-4 text-right">{t("creditNoteAmountCol")}</th>
+            <th className="pb-2 pr-4 text-right">{t("creditNoteKindCol")}</th>
+            <th className="pb-2 text-right">{t("creditNotePdfCol")}</th>
+          </tr>
+        </thead>
+        <tbody>
+          {creditNotes.map((cn) => (
+            <tr
+              key={cn.id}
+              className="border-t border-border align-middle"
+            >
+              <td className="py-2 pr-4 font-mono text-xs">
+                {cn.creditNoteNumber}
+              </td>
+              <td className="py-2 pr-4 font-mono text-xs text-text-secondary">
+                {cn.invoiceNumber}
+              </td>
+              <td className="py-2 pr-4 text-text-secondary whitespace-nowrap">
+                {fmt.dateTime(new Date(cn.issuedAt), { dateStyle: "medium" })}
+              </td>
+              <td className="py-2 pr-4 text-right font-mono whitespace-nowrap">
+                CHF {cn.amountChf.toFixed(2)}
+              </td>
+              <td className="py-2 pr-4 text-right">
+                <span
+                  className={`px-2 py-0.5 rounded text-xs ${
+                    kindColors[cn.kind] ?? ""
+                  }`}
+                >
+                  {t(`creditNoteKind_${cn.kind}` as any)}
+                </span>
+              </td>
+              <td className="py-2 text-right">
+                {cn.hasPdf ? (
+                  <a
+                    href={`/api/credit-notes/${encodeURIComponent(
+                      cn.creditNoteNumber
+                    )}/pdf`}
+                    className="text-accent hover:underline text-xs"
+                    target="_blank"
+                    rel="noopener noreferrer"
+                  >
+                    {t("downloadPdf")}
+                  </a>
+                ) : (
+                  <span className="text-text-muted text-xs italic">
+                    {t("creditNoteNoPdf")}
+                  </span>
+                )}
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </Card>
+  );
+}

src/components/billing/customer-invoice-detail.tsx

@@ -46,11 +46,17 @@ export function CustomerInvoiceDetail({ invoice, lines }: Props) {
               {t(`status.${invoice.status}` as any)}
             </span>
           </div>
-          <p className="text-sm text-text-secondary">
-            {fmt.dateTime(new Date(invoice.periodStart), { dateStyle: "long" })}
-            <span className="text-text-muted mx-1">→</span>
-            {fmt.dateTime(new Date(invoice.periodEnd), { dateStyle: "long" })}
-          </p>
+          {invoice.periodStart && invoice.periodEnd && (
+            <p className="text-sm text-text-secondary">
+              {fmt.dateTime(new Date(invoice.periodStart), {
+                dateStyle: "long",
+              })}
+              <span className="text-text-muted mx-1">→</span>
+              {fmt.dateTime(new Date(invoice.periodEnd), {
+                dateStyle: "long",
+              })}
+            </p>
+          )}
         </div>
         <div className="flex items-start gap-2 flex-wrap">
           {/* Phase 4: Pay-with-card available for open + overdue.

src/components/billing/customer-invoice-list.tsx

@@ -12,6 +12,13 @@ const statusColors: Record<string, string> = {
   paid: "text-success bg-success/10",
   overdue: "text-error bg-error/10",
   void: "text-text-muted bg-surface-3 line-through",
+  // Phase 7: refund states. Red tinting matches the credit-note
+  // PDF accent so customers reading the table get a visual cue
+  // that something was credited back. partially_refunded reads
+  // as a partial state (mixed colour), fully_refunded reads as
+  // closed (line-through like void).
+  partially_refunded: "text-error bg-error/10",
+  fully_refunded: "text-text-muted bg-error/10 line-through",
 };
 
 /**
@@ -64,9 +71,19 @@ export function CustomerInvoiceList({ invoices }: Props) {
                 </Link>
               </td>
               <td className="py-2 text-xs text-text-secondary">
-                {fmt.dateTime(new Date(inv.periodStart), { dateStyle: "medium" })}
-                <span className="text-text-muted mx-1">→</span>
-                {fmt.dateTime(new Date(inv.periodEnd), { dateStyle: "medium" })}
+                {inv.periodStart && inv.periodEnd ? (
+                  <>
+                    {fmt.dateTime(new Date(inv.periodStart), {
+                      dateStyle: "medium",
+                    })}
+                    <span className="text-text-muted mx-1">→</span>
+                    {fmt.dateTime(new Date(inv.periodEnd), {
+                      dateStyle: "medium",
+                    })}
+                  </>
+                ) : (
+                  <span className="text-text-muted">—</span>
+                )}
               </td>
               <td className="py-2 text-xs text-text-secondary">
                 {fmt.dateTime(new Date(inv.dueAt), { dateStyle: "medium" })}

src/components/billing/running-total-widget.tsx

@@ -125,9 +125,16 @@ export function RunningTotalWidget({ isOwner }: Props) {
   }
   // draft
   const draft = data.draft;
-  const periodLabel = `${fmt.dateTime(new Date(draft.periodStart), {
-    dateStyle: "long",
-  })} → ${fmt.dateTime(new Date(draft.periodEnd), { dateStyle: "long" })}`;
+  // Phase 8: InvoiceDraft.periodStart/End became nullable for the
+  // custom-invoice flow. The running-total widget only renders the
+  // auto-cron draft (always has a period), so the null branch is
+  // defensive — if we ever did hit it the label just collapses.
+  const periodLabel =
+    draft.periodStart && draft.periodEnd
+      ? `${fmt.dateTime(new Date(draft.periodStart), {
+          dateStyle: "long",
+        })} → ${fmt.dateTime(new Date(draft.periodEnd), { dateStyle: "long" })}`
+      : "";
   return (
     <Card>
       <div className="flex items-start justify-between gap-4 flex-wrap mb-3">

src/lib/billing-i18n.ts

@@ -153,5 +153,21 @@ export function formatLineDescription(
       }[L];
       return reason ? `${base}: ${reason}` : base;
     }
+
+    // Phase 8: custom invoice lines. The description is what the
+    // admin typed in the editor — return it verbatim (no template,
+    // no locale-specific formatting). billing.ts persists the
+    // already-trimmed admin input into invoice_lines.description.
+    case "custom_line": {
+      const dRaw = (m as Record<string, unknown>)["description"];
+      if (typeof dRaw === "string" && dRaw.trim().length > 0) return dRaw;
+      // Fallback: the description column on the row itself. The
+      // PDF renderer hands us the line so it can read it directly
+      // — see how billing-pdf invokes formatLineDescription.
+      const onRow = (line as unknown as { description?: string }).description;
+      return onRow && onRow.trim().length > 0
+        ? onRow
+        : { de: "Leistung", en: "Service", fr: "Service", it: "Servizio" }[L];
+    }
   }
 }

src/lib/billing-pdf.tsx

@@ -31,44 +31,18 @@ import {
   Text,
   View,
   StyleSheet,
-  Svg,
-  Polygon,
-  Polyline,
   renderToBuffer,
 } from "@react-pdf/renderer";
 import type { Invoice, InvoiceLine, InvoiceLineKind } from "@/types";
+import { BRAND, Logo } from "./pdf-brand";
 
 // ---------------------------------------------------------------------------
-// Brand constants — edit here to tweak look without touching layout
+// Brand: imported from lib/pdf-brand. Edit there to change issuer
+// info, colours, or the logo. Both billing-pdf.tsx and credit-note-pdf.tsx
+// share the same source of truth so a brand change applies to every
+// PDF the portal produces.
 // ---------------------------------------------------------------------------
 
-const BRAND = {
-  name: "PieCed IT",
-  // Primary emerald — matches the logo SVG fill (#10B981).
-  primary: "#10B981",
-  // Slightly darker emerald for headings.
-  primaryDark: "#0a8060",
-  textColor: "#1a1a1a",
-  mutedColor: "#666",
-  borderColor: "#d4d4d4",
-  // Issuer block — change these to your real legal info.
-  issuer: {
-    legalName: "PieCed IT",
-    addressLine1: "Cedric Mosimann",
-    addressLine2: "[Strasse Nr.]",
-    postalCity: "[PLZ] Basel",
-    country: "Switzerland",
-    email: "billing@pieced.ch",
-    web: "pieced.ch",
-    // Show "MWST-Nr. ..." on PDF when set.
-    vatNumber: null as string | null,
-    // Bank instructions — Phase 7 replaces with QR-bill.
-    bankName: "[Bank name]",
-    bankIban: "[CHxx xxxx xxxx xxxx xxxx x]",
-    bankBic: "[BIC]",
-  },
-};
-
 // ---------------------------------------------------------------------------
 // Localized strings
 // ---------------------------------------------------------------------------
@@ -133,6 +107,7 @@ const MESSAGES: Record<string, PdfStrings> = {
       skill_usage: "Skill-Nutzung",
       skill_setup: "Einrichtungsgebühr Skill",
       adjustment: "Anpassung",
+      custom_line: "Leistungen",
     },
     reverseCharge:
       "Steuerschuldnerschaft des Leistungsempfängers (Reverse Charge).",
@@ -166,6 +141,7 @@ const MESSAGES: Record<string, PdfStrings> = {
       skill_usage: "Skill usage",
       skill_setup: "Skill setup fee",
       adjustment: "Adjustment",
+      custom_line: "Services",
     },
     reverseCharge:
       "Reverse charge — VAT to be accounted for by the recipient.",
@@ -199,6 +175,7 @@ const MESSAGES: Record<string, PdfStrings> = {
       skill_usage: "Utilisation Skill",
       skill_setup: "Frais de configuration skill",
       adjustment: "Ajustement",
+      custom_line: "Services",
     },
     reverseCharge:
       "Autoliquidation — TVA à acquitter par le destinataire.",
@@ -232,6 +209,7 @@ const MESSAGES: Record<string, PdfStrings> = {
       skill_usage: "Utilizzo Skill",
       skill_setup: "Spese di attivazione skill",
       adjustment: "Rettifica",
+      custom_line: "Servizi",
     },
     reverseCharge:
       "Inversione contabile — IVA a carico del destinatario.",
@@ -358,62 +336,6 @@ const styles = StyleSheet.create({
 });
 
 // ---------------------------------------------------------------------------
-// Logo — inlined SVG primitives
-// ---------------------------------------------------------------------------
-
-/**
- * PieCed honeycomb logo. Re-renders the same 6-hex glyph as the
- * portal's `public/pieced-logo.svg` using React-PDF's SVG support.
- * Width/height are independent of the original viewBox so we can
- * scale it without losing stroke quality.
- */
-const Logo = ({ size = 60 }: { size?: number }) => (
-  <Svg width={size} height={size * (106 / 70)} viewBox="0 0 70 106">
-    {/* H1 solid */}
-    <Polygon
-      points="38.5,22.69 31.5,10.566 17.5,10.566 10.5,22.69 17.5,34.814 31.5,34.814"
-      fill="#10B981"
-      stroke="#10B981"
-      strokeWidth={1.6}
-    />
-    {/* H2 outline */}
-    <Polygon
-      points="59.5,34.814 52.5,22.69 38.5,22.69 31.5,34.814 38.5,46.938 52.5,46.938"
-      fill="none"
-      stroke="#10B981"
-      strokeWidth={1.8}
-    />
-    {/* H3 outline */}
-    <Polygon
-      points="38.5,46.938 31.5,34.814 17.5,34.814 10.5,46.938 17.5,59.062 31.5,59.062"
-      fill="none"
-      stroke="#10B981"
-      strokeWidth={1.8}
-    />
-    {/* H4 solid */}
-    <Polygon
-      points="59.5,59.062 52.5,46.938 38.5,46.938 31.5,59.062 38.5,71.186 52.5,71.186"
-      fill="#10B981"
-      stroke="#10B981"
-      strokeWidth={1.6}
-    />
-    {/* H5 partial */}
-    <Polyline
-      points="31.5,83.31 38.5,71.186 31.5,59.062 17.5,59.062 10.5,71.186"
-      fill="none"
-      stroke="#10B981"
-      strokeWidth={1.8}
-    />
-    {/* H6 partial */}
-    <Polyline
-      points="59.5,83.31 52.5,71.186 38.5,71.186 31.5,83.31 38.5,95.434"
-      fill="none"
-      stroke="#10B981"
-      strokeWidth={1.8}
-    />
-  </Svg>
-);
-
 // ---------------------------------------------------------------------------
 // Helpers
 // ---------------------------------------------------------------------------
@@ -517,11 +439,18 @@ const InvoicePdf: React.FC<InvoicePdfProps> = ({ invoice, lines }) => {
             </Text>
           </View>
           <View style={styles.metaCol}>
-            <Text style={styles.metaLabel}>{s.period}</Text>
-            <Text style={styles.metaValue}>
-              {fmtDate(invoice.periodStart, invoice.locale)} —{" "}
-              {fmtDate(invoice.periodEnd, invoice.locale)}
-            </Text>
+            {/* Phase 8: skip the billing-period block on custom
+                invoices (which aren't tied to a period). Due date
+                still renders. */}
+            {invoice.periodStart && invoice.periodEnd && (
+              <>
+                <Text style={styles.metaLabel}>{s.period}</Text>
+                <Text style={styles.metaValue}>
+                  {fmtDate(invoice.periodStart, invoice.locale)} —{" "}
+                  {fmtDate(invoice.periodEnd, invoice.locale)}
+                </Text>
+              </>
+            )}
             <Text style={styles.metaLabel}>{s.dueDate}</Text>
             <Text style={styles.metaValue}>
               {fmtDate(invoice.dueAt, invoice.locale)}

src/lib/billing.ts

@@ -30,9 +30,12 @@
  */
 
 import type {
+  CreditNote,
+  CustomInvoiceDraftPayload,
   Invoice,
   InvoiceBillingSnapshot,
   InvoiceDraft,
+  InvoiceDraftRecord,
   InvoiceLine,
   InvoiceLineKind,
   InvoicePaymentMethod,
@@ -44,8 +47,12 @@ import type {
   TenantSuspensionEvent,
 } from "@/types";
 import {
+  attachCreditNotePdf,
+  createCreditNote,
   createInvoice,
+  deleteInvoiceDraft,
   getInvoiceById,
+  getInvoiceDraftById,
   getOrgBilling,
   getOrgBillingConfig,
   getPlatformPricing,
@@ -53,6 +60,8 @@ import {
   listSkillEventsForTenant,
   listSkillPricing,
   listSuspensionEventsForTenant,
+  markInvoiceVoided,
+  recordInvoiceRefund,
   tenantHasSetupFeeBilled,
   tenantSkillHasBeenBilled,
   updateInvoicePdf,
@@ -61,7 +70,9 @@ import { listTenants } from "./k8s";
 import { getTeamSpendLogsV2 } from "./litellm";
 import { getUsage as getThreemaUsage } from "./threema-relay";
 import { renderInvoicePdf } from "./billing-pdf";
-import { sendInvoiceIssuedEmail } from "./email";
+import { renderCreditNotePdf } from "./credit-note-pdf";
+import { sendCreditNoteEmail, sendInvoiceIssuedEmail } from "./email";
+import { createInvoiceRefund } from "./stripe";
 import { formatLineDescription } from "./billing-i18n";
 
 // ---------------------------------------------------------------------------
@@ -240,6 +251,9 @@ const EU_COUNTRIES = new Set([
 
 /**
  * Determine VAT rate from billing address and the platform default.
+ * Exported for reuse by the Phase 8 custom-invoice flow so both
+ * pipelines (cron and custom) compute VAT identically.
+ *
  * See README for the legal interpretation; this implements the
  * defaults you confirmed:
  *
@@ -248,7 +262,7 @@ const EU_COUNTRIES = new Set([
  *   - EU without VAT:  CH MWST (B2C consumer, we charge our rate)
  *   - other:           0% (export of services)
  */
-function vatRateForAddress(
+export function vatRateForAddress(
   snapshot: InvoiceBillingSnapshot,
   platformPricing: PlatformPricing
 ): { rate: number; note: string | null } {
@@ -836,3 +850,692 @@ export async function generateInvoice(opts: {
     );
   }
 }
+
+// ---------------------------------------------------------------------------
+// Phase 7 — void and refund orchestration
+// ---------------------------------------------------------------------------
+
+export class VoidNotAllowedError extends Error {
+  constructor(message: string, public readonly currentStatus: string) {
+    super(message);
+    this.name = "VoidNotAllowedError";
+  }
+}
+
+export class RefundNotAllowedError extends Error {
+  constructor(message: string, public readonly currentStatus: string) {
+    super(message);
+    this.name = "RefundNotAllowedError";
+  }
+}
+
+/**
+ * Sanitize a locale string to the supported four. Used when picking
+ * which translation block to render emails/PDFs with. We never
+ * fall back to admin's locale here — the credit note inherits the
+ * invoice's locale so both documents read consistently to the
+ * customer.
+ */
+function pickSupportedLocale(
+  locale: string | null | undefined
+): "de" | "en" | "fr" | "it" {
+  const supported = ["de", "en", "fr", "it"] as const;
+  return (supported as readonly string[]).includes(locale ?? "")
+    ? (locale as "de" | "en" | "fr" | "it")
+    : "de";
+}
+
+/**
+ * Round a CHF amount to 2 decimal places. Used when proportionally
+ * splitting VAT between subtotal and refund amount — avoids
+ * accumulating fractional rappen across operations.
+ */
+function roundChf(amount: number): number {
+  return Math.round(amount * 100) / 100;
+}
+
+/**
+ * Void an unpaid invoice. State transition: open/overdue → void.
+ *
+ * Side effects, in order:
+ *   1. Mark the invoice voided (status, void_reason, voided_at, voided_by)
+ *   2. Insert credit_notes row (kind='void', amount=full invoice total)
+ *   3. Render the credit-note PDF and attach it to the row
+ *   4. Best-effort email to the billing contact
+ *
+ * Not allowed:
+ *   - status='paid' (use refundInvoice instead — voiding paid
+ *     invoices would create a record mismatch with the payment
+ *     processor)
+ *   - status='void' (already voided)
+ *   - status='draft' (drafts aren't issued; nothing to void)
+ *   - status='partially_refunded' / 'fully_refunded' (use refund
+ *     for the remaining amount instead)
+ *
+ * Throws VoidNotAllowedError if the invoice is in a non-voidable
+ * state. Caller surfaces this as 409 Conflict to the admin.
+ */
+export async function voidInvoice(params: {
+  invoiceId: string;
+  reason: string;
+  voidedBy: string;
+}): Promise<CreditNote> {
+  const invoice = await getInvoiceById(params.invoiceId);
+  if (!invoice) {
+    throw new Error(`Invoice not found: ${params.invoiceId}`);
+  }
+  // Only unpaid invoices can be voided. The state machine puts
+  // paid invoices on the refund path; voiding them would skip the
+  // payment reversal and leave the customer's money in our account
+  // with no obligation showing in the portal.
+  if (!["open", "overdue"].includes(invoice.status)) {
+    throw new VoidNotAllowedError(
+      `Cannot void invoice in status '${invoice.status}'. Voids are allowed only for open or overdue invoices; paid invoices must be refunded.`,
+      invoice.status
+    );
+  }
+  const locale = pickSupportedLocale(invoice.locale);
+
+  // The credit note matches the invoice 1:1 in amount and VAT.
+  // We carry the same VAT breakdown so the PDF can render
+  // "subtotal + VAT" the same way the original invoice did.
+  const creditNote = await createCreditNote({
+    invoiceId: invoice.id,
+    zitadelOrgId: invoice.zitadelOrgId,
+    kind: "void",
+    amountChf: invoice.totalChf,
+    vatAmountChf: invoice.vatAmountChf,
+    reason: params.reason || null,
+    issuedBy: params.voidedBy,
+    locale,
+    billingSnapshot: invoice.billingSnapshot,
+  });
+
+  // Mark invoice voided AFTER the credit note row exists, so the
+  // status change has a credit note to point at. If anything below
+  // here fails (PDF render, email), the invoice is still correctly
+  // voided and the credit note row exists — just without a PDF
+  // until manually re-rendered.
+  await markInvoiceVoided({
+    invoiceId: invoice.id,
+    reason: params.reason,
+    voidedBy: params.voidedBy,
+  });
+
+  // Render PDF + attach. PDF failure here doesn't undo the void —
+  // the customer can be told their invoice is voided and the PDF
+  // can be re-issued later. We surface the error in the response
+  // so admin knows to retry, but the void itself stands.
+  try {
+    const pdfBuffer = await renderCreditNotePdf(creditNote, invoice);
+    const filename = `${creditNote.creditNoteNumber}.pdf`;
+    await attachCreditNotePdf(creditNote.id, pdfBuffer, filename);
+  } catch (e) {
+    console.error(
+      `Credit note ${creditNote.creditNoteNumber} created but PDF render failed; re-render manually.`,
+      e
+    );
+  }
+
+  // Best-effort email. Same fail-soft pattern as invoice issuance.
+  try {
+    const snap = invoice.billingSnapshot;
+    if (snap.billingEmail) {
+      await sendCreditNoteEmail({
+        to: snap.billingEmail,
+        contactName: snap.contactName || snap.companyName,
+        companyName: snap.companyName,
+        creditNoteNumber: creditNote.creditNoteNumber,
+        invoiceNumber: invoice.invoiceNumber,
+        amountChf: creditNote.amountChf,
+        currency: "CHF",
+        kind: "void",
+        reason: params.reason || null,
+        locale,
+      });
+    }
+  } catch (e) {
+    console.error(
+      `Credit note ${creditNote.creditNoteNumber} issued; email send failed.`,
+      e
+    );
+  }
+
+  return creditNote;
+}
+
+/**
+ * Refund a paid invoice (in part or in full). State transition:
+ *   paid → partially_refunded (if amount < remaining)
+ *   paid → fully_refunded     (if amount >= remaining)
+ *   partially_refunded → fully_refunded (if cumulative >= total)
+ *
+ * Side effects, in order:
+ *   1. If the invoice was Stripe-paid (payment_method='card' with a
+ *      stripe_payment_intent_id) AND no `existingStripeRefund` was
+ *      passed, call Stripe to issue the refund. Stripe is the source
+ *      of truth for actual money movement; we mirror its outcome
+ *      locally.
+ *   2. Insert credit_notes row (kind='refund', amount=refund amount,
+ *      VAT proportional)
+ *   3. Insert invoice_refunds row, linking to the credit note and to
+ *      the Stripe refund (if any). recordInvoiceRefund updates the
+ *      invoice's status atomically based on the new running total.
+ *   4. Render PDF + attach
+ *   5. Best-effort email
+ *
+ * `existingStripeRefund` is for the webhook path: when Stripe fires
+ * `charge.refunded` for a refund that was initiated directly in the
+ * Stripe Dashboard (not via this portal), the webhook needs to
+ * mirror the refund into the DB and issue a credit note WITHOUT
+ * calling Stripe again. Pass the refund id and status to skip the
+ * Stripe call.
+ *
+ * Not allowed:
+ *   - status not in {paid, partially_refunded} — full refunds are
+ *     only meaningful against actual payment
+ *   - amount <= 0 or > remaining refundable
+ *
+ * For invoice-paid (non-Stripe) customers the Stripe step is
+ * skipped; refund settlement happens out-of-band (bank transfer)
+ * and admin records the action in the portal.
+ */
+export async function refundInvoice(params: {
+  invoiceId: string;
+  amountChf: number;
+  reason: string;
+  refundedBy: string;
+  /**
+   * Webhook path: a Stripe refund that has already been created
+   * (in the Stripe Dashboard or via a prior API call) and now needs
+   * to be mirrored into the portal. When set, the Stripe API call
+   * is skipped and the provided id/status are recorded as-is.
+   */
+  existingStripeRefund?: {
+    id: string;
+    status: "pending" | "succeeded" | "failed" | "canceled";
+  };
+}): Promise<CreditNote> {
+  const invoice = await getInvoiceById(params.invoiceId);
+  if (!invoice) {
+    throw new Error(`Invoice not found: ${params.invoiceId}`);
+  }
+  if (!["paid", "partially_refunded"].includes(invoice.status)) {
+    throw new RefundNotAllowedError(
+      `Cannot refund invoice in status '${invoice.status}'. Refunds are allowed only for paid invoices.`,
+      invoice.status
+    );
+  }
+  if (params.amountChf <= 0) {
+    throw new RefundNotAllowedError(
+      "Refund amount must be greater than zero.",
+      invoice.status
+    );
+  }
+  const remaining = roundChf(invoice.totalChf - invoice.refundedTotalChf);
+  if (params.amountChf - remaining > 0.005) {
+    // Allow a 0.005 tolerance to account for floating-point dust;
+    // anything genuinely larger is a real over-refund attempt.
+    throw new RefundNotAllowedError(
+      `Refund amount CHF ${params.amountChf.toFixed(2)} exceeds remaining refundable CHF ${remaining.toFixed(2)}.`,
+      invoice.status
+    );
+  }
+  const locale = pickSupportedLocale(invoice.locale);
+
+  // Proportional VAT split: refunded VAT / total VAT  =  refunded
+  // amount / total amount. Keep the proportion explicit so the
+  // credit note's "subtotal + VAT" lines reconcile to the same
+  // VAT rate as the original invoice.
+  const vatPortion =
+    invoice.totalChf > 0
+      ? roundChf((params.amountChf * invoice.vatAmountChf) / invoice.totalChf)
+      : 0;
+
+  // Step 1: Stripe (only for card-paid invoices, and only when the
+  // caller hasn't already created the refund). We do this BEFORE
+  // any local DB writes for refund tracking — Stripe is the source
+  // of truth for money movement, and if the Stripe call fails we
+  // must NOT have recorded the refund locally (the customer would
+  // see a credit note for money they never received).
+  //
+  // The charge.refunded webhook will also fire later, but we record
+  // the refund here too so the admin gets immediate confirmation
+  // and the credit note can be issued without waiting for the
+  // webhook round-trip. The webhook is idempotent (dedups by
+  // stripe_refund_id) so it's safe to do both.
+  let stripeRefundId: string | null = null;
+  let stripeStatus: "pending" | "succeeded" | "failed" | "canceled" =
+    "succeeded";
+  const isStripePaid =
+    invoice.paymentMethod === "card" && !!invoice.stripePaymentIntentId;
+  if (params.existingStripeRefund) {
+    // Webhook path: don't call Stripe again; trust the provided id.
+    stripeRefundId = params.existingStripeRefund.id;
+    stripeStatus = params.existingStripeRefund.status;
+  } else if (isStripePaid) {
+    try {
+      const refund = await createInvoiceRefund({
+        paymentIntentId: invoice.stripePaymentIntentId!,
+        amountChf: params.amountChf,
+        reason: "requested_by_customer",
+        metadata: {
+          invoice_number: invoice.invoiceNumber,
+          refunded_by: params.refundedBy,
+        },
+      });
+      stripeRefundId = refund.id;
+      // Map Stripe statuses to our enum. Anything other than
+      // 'succeeded' or 'pending' is treated as a failure — we
+      // don't record the credit note in that case (see below).
+      if (refund.status === "succeeded") stripeStatus = "succeeded";
+      else if (refund.status === "pending") stripeStatus = "pending";
+      else if (refund.status === "canceled") stripeStatus = "canceled";
+      else stripeStatus = "failed";
+    } catch (e) {
+      throw new Error(
+        `Stripe refund failed: ${e instanceof Error ? e.message : String(e)}`
+      );
+    }
+    if (stripeStatus === "failed" || stripeStatus === "canceled") {
+      throw new Error(
+        `Stripe refund returned non-success status: ${stripeStatus}`
+      );
+    }
+  }
+
+  // Step 2: insert credit note (PDF still null at this point).
+  const creditNote = await createCreditNote({
+    invoiceId: invoice.id,
+    zitadelOrgId: invoice.zitadelOrgId,
+    kind: "refund",
+    amountChf: params.amountChf,
+    vatAmountChf: vatPortion,
+    reason: params.reason || null,
+    issuedBy: params.refundedBy,
+    locale,
+    billingSnapshot: invoice.billingSnapshot,
+  });
+
+  // Step 3: record the refund event and bump invoice status.
+  // recordInvoiceRefund handles status transitions and idempotency.
+  await recordInvoiceRefund({
+    invoiceId: invoice.id,
+    stripeRefundId,
+    amountChf: params.amountChf,
+    reason: params.reason || null,
+    refundedBy: params.refundedBy,
+    creditNoteId: creditNote.id,
+    status: stripeStatus,
+  });
+
+  // Step 4: render + attach PDF. As with voidInvoice, a PDF failure
+  // here doesn't undo the refund — the refund happened (in Stripe
+  // and the DB), only the document is missing. Admin can re-render.
+  try {
+    const pdfBuffer = await renderCreditNotePdf(creditNote, invoice);
+    const filename = `${creditNote.creditNoteNumber}.pdf`;
+    await attachCreditNotePdf(creditNote.id, pdfBuffer, filename);
+  } catch (e) {
+    console.error(
+      `Credit note ${creditNote.creditNoteNumber} created but PDF render failed; re-render manually.`,
+      e
+    );
+  }
+
+  // Step 5: best-effort email.
+  try {
+    const snap = invoice.billingSnapshot;
+    if (snap.billingEmail) {
+      await sendCreditNoteEmail({
+        to: snap.billingEmail,
+        contactName: snap.contactName || snap.companyName,
+        companyName: snap.companyName,
+        creditNoteNumber: creditNote.creditNoteNumber,
+        invoiceNumber: invoice.invoiceNumber,
+        amountChf: creditNote.amountChf,
+        currency: "CHF",
+        kind: "refund",
+        reason: params.reason || null,
+        locale,
+      });
+    }
+  } catch (e) {
+    console.error(
+      `Credit note ${creditNote.creditNoteNumber} issued; email send failed.`,
+      e
+    );
+  }
+
+  return creditNote;
+}
+
+// ---------------------------------------------------------------------------
+// Phase 8 — custom invoices (admin-entered, ad-hoc)
+// ---------------------------------------------------------------------------
+
+export class CustomInvoiceValidationError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = "CustomInvoiceValidationError";
+  }
+}
+
+/**
+ * Compute the totals for a custom-invoice draft payload, applying
+ * the same VAT logic the auto cron uses (vatRateForAddress against
+ * the org's billing snapshot).
+ *
+ * Returns the InvoiceDraft the createInvoice helper expects.
+ * Throws CustomInvoiceValidationError on:
+ *   - no lines
+ *   - any line with empty description or zero quantity
+ *   - invalid date (issue or due)
+ *   - issue date in past beyond 1 year (probably a typo)
+ *   - due before issue
+ *
+ * Negative line amounts are intentionally allowed — they're the
+ * Rabatt / discount mechanism (one row with a negative unitPriceChf).
+ * The algebraic sum becomes the subtotal.
+ */
+export async function computeCustomInvoiceTotals(params: {
+  zitadelOrgId: string;
+  payload: CustomInvoiceDraftPayload;
+}): Promise<InvoiceDraft> {
+  const { zitadelOrgId, payload } = params;
+
+  // Validation
+  if (!payload.lines || payload.lines.length === 0) {
+    throw new CustomInvoiceValidationError(
+      "Custom invoice must have at least one line."
+    );
+  }
+  for (let i = 0; i < payload.lines.length; i++) {
+    const ln = payload.lines[i];
+    if (!ln.description || !ln.description.trim()) {
+      throw new CustomInvoiceValidationError(
+        `Line ${i + 1}: description is required.`
+      );
+    }
+    if (
+      typeof ln.quantity !== "number" ||
+      !isFinite(ln.quantity) ||
+      ln.quantity === 0
+    ) {
+      throw new CustomInvoiceValidationError(
+        `Line ${i + 1}: quantity must be a non-zero number.`
+      );
+    }
+    if (typeof ln.unitPriceChf !== "number" || !isFinite(ln.unitPriceChf)) {
+      throw new CustomInvoiceValidationError(
+        `Line ${i + 1}: unit price must be a number (use negative for discounts).`
+      );
+    }
+  }
+  const issueDate = payload.issueDate;
+  const dueDate = payload.dueDate;
+  if (!/^\d{4}-\d{2}-\d{2}$/.test(issueDate)) {
+    throw new CustomInvoiceValidationError(
+      "Issue date must be a valid YYYY-MM-DD."
+    );
+  }
+  if (!/^\d{4}-\d{2}-\d{2}$/.test(dueDate)) {
+    throw new CustomInvoiceValidationError(
+      "Due date must be a valid YYYY-MM-DD."
+    );
+  }
+  if (dueDate < issueDate) {
+    throw new CustomInvoiceValidationError(
+      "Due date cannot be before issue date."
+    );
+  }
+
+  // Billing snapshot — required for any invoice to render.
+  const orgBilling = await getOrgBilling(zitadelOrgId);
+  if (!orgBilling) {
+    throw new CustomInvoiceValidationError(
+      "Org has no billing configuration. Ask the customer to complete onboarding first, or set the billing info from the admin panel."
+    );
+  }
+  // Build the same snapshot shape the auto-cron freezes. Mirroring
+  // the auto flow keeps the PDF renderer happy with one code path.
+  const snapshot: InvoiceBillingSnapshot = {
+    companyName: orgBilling.companyName,
+    contactName: orgBilling.contactName ?? null,
+    streetAddress: orgBilling.streetAddress,
+    city: orgBilling.city,
+    postalCode: orgBilling.postalCode,
+    country: orgBilling.country,
+    vatNumber: orgBilling.vatNumber ?? null,
+    billingEmail: orgBilling.billingEmail,
+    notes: orgBilling.notes ?? null,
+  };
+
+  // VAT — same logic as auto.
+  const platformPricing = await getPlatformPricing();
+  const vat = vatRateForAddress(snapshot, platformPricing);
+
+  // Build invoice lines. quantity * unitPrice rounded to 2 decimals
+  // (rappen precision). We carry the per-line amount on the row so
+  // the PDF doesn't need to recompute and any rounding remains
+  // identical between rendering passes.
+  //
+  // tenantName=null because custom invoices aren't bound to a
+  // specific tenant. unitLabel=null because admin-entered lines are
+  // free-form (the auto-cron lines use "day" / "request" /
+  // "message" — for custom lines the quantity is just a number).
+  // metadata.description preserves the admin's input so
+  // formatLineDescription can read it via the metadata channel
+  // (the row's description column also has it, redundantly, for
+  // safety). displayOrder reflects the order the admin added the
+  // rows so the PDF renders them top-to-bottom unchanged.
+  const lines: Omit<InvoiceLine, "id" | "invoiceId">[] = payload.lines.map(
+    (ln, idx) => {
+      const amount = Math.round(ln.quantity * ln.unitPriceChf * 100) / 100;
+      return {
+        tenantName: null,
+        kind: "custom_line" as InvoiceLineKind,
+        description: ln.description.trim(),
+        quantity: ln.quantity,
+        unitLabel: null,
+        unitPriceChf: ln.unitPriceChf,
+        amountChf: amount,
+        metadata: { description: ln.description.trim() },
+        displayOrder: idx,
+      };
+    }
+  );
+
+  // Subtotal is the algebraic sum (negative lines reduce it).
+  const subtotalChf = Math.round(
+    lines.reduce((s, l) => s + l.amountChf, 0) * 100
+  ) / 100;
+  // VAT applies to the subtotal AFTER discounts (which is the
+  // legal default in CH — discounts reduce the taxable base).
+  const vatAmountChf = Math.round(subtotalChf * (vat.rate / 100) * 100) / 100;
+  const totalChf = Math.round((subtotalChf + vatAmountChf) * 100) / 100;
+
+  return {
+    zitadelOrgId,
+    source: "custom",
+    periodStart: null,
+    periodEnd: null,
+    issuedAt: `${issueDate}T00:00:00Z`,
+    dueAt: dueDate,
+    locale: payload.locale,
+    paymentMethod: payload.paymentMethod,
+    billingSnapshot: snapshot,
+    lines,
+    subtotalChf,
+    vatRate: vat.rate,
+    vatAmountChf,
+    totalChf,
+    warnings: [],
+  };
+}
+
+/**
+ * Issue a custom invoice from a draft. Three-step flow:
+ *
+ *   1. Compute totals + validate the payload (computeCustomInvoiceTotals)
+ *   2. Persist via createInvoice (allocates the number, inserts the
+ *      row + lines, source='custom', issued_at honours the override)
+ *   3. Render PDF, send email — best-effort each. PDF render failure
+ *      leaves the row in place with no PDF; admin can re-render. Email
+ *      failure is logged.
+ *
+ * After successful persistence, the draft row is deleted (its job
+ * is done). If persistence fails, the draft stays so the admin can
+ * fix the issue and try again.
+ */
+export async function issueCustomInvoiceDraft(params: {
+  draftId: string;
+  issuedBy: string;
+}): Promise<Invoice> {
+  const draft = await getInvoiceDraftById(params.draftId);
+  if (!draft) {
+    throw new CustomInvoiceValidationError(
+      `Draft not found: ${params.draftId}`
+    );
+  }
+  const invoiceDraft = await computeCustomInvoiceTotals({
+    zitadelOrgId: draft.zitadelOrgId,
+    payload: draft.payload,
+  });
+
+  // Two-pass: persist without PDF first, render against the canonical
+  // row (now has a number), then attach. Same pattern as the auto
+  // flow — keeps the PDF self-referential without juggling temporary
+  // numbers.
+  const placeholder = await createInvoice(invoiceDraft, null, null);
+
+  let pdfBuffer: Buffer | null = null;
+  try {
+    pdfBuffer = await renderInvoicePdf(
+      placeholder,
+      // Same pattern as the auto-cron generateInvoice: synthesize
+      // temporary ids for the PDF renderer. The real DB rows have
+      // these populated post-insert, but the renderer only reads
+      // them for React keys (display) and id-comparison-free
+      // operations, so synthetic values are fine.
+      invoiceDraft.lines.map((l, i) => ({
+        ...l,
+        id: `tmp-${i}`,
+        invoiceId: placeholder.id,
+      }))
+    );
+    const filename = `${placeholder.invoiceNumber}.pdf`;
+    await updateInvoicePdf(placeholder.id, pdfBuffer, filename);
+  } catch (e) {
+    console.error(
+      `Custom invoice ${placeholder.invoiceNumber} persisted but PDF render failed:`,
+      e
+    );
+    // Don't throw — the row exists. Admin can re-render via a
+    // future tool (Phase 8.5 or just by deleting+reissuing).
+  }
+
+  // Best-effort email.
+  try {
+    const snap = invoiceDraft.billingSnapshot;
+    if (snap.billingEmail) {
+      await sendInvoiceIssuedEmail({
+        to: snap.billingEmail,
+        contactName: snap.contactName || snap.companyName,
+        companyName: snap.companyName,
+        invoiceNumber: placeholder.invoiceNumber,
+        totalChf: placeholder.totalChf,
+        currency: "CHF",
+        dueAt: placeholder.dueAt,
+        lineCount: invoiceDraft.lines.length,
+        periodStart: null,
+        periodEnd: null,
+        locale: invoiceDraft.locale as "de" | "en" | "fr" | "it",
+      });
+    }
+  } catch (e) {
+    console.error(
+      `Custom invoice ${placeholder.invoiceNumber} issued; email send failed.`,
+      e
+    );
+  }
+
+  // Draft did its job — remove it. If this fails the issuance
+  // still stands (we already have a real invoice). Log and move on.
+  try {
+    await deleteInvoiceDraft(draft.id);
+  } catch (e) {
+    console.error(
+      `Custom invoice ${placeholder.invoiceNumber} issued but draft ${draft.id} could not be deleted:`,
+      e
+    );
+  }
+
+  return placeholder;
+}
+
+/**
+ * Preview a draft as a PDF without persisting an invoice. The PDF
+ * is rendered with a placeholder number ("DRAFT") and not stored
+ * anywhere — the caller streams the bytes back to the admin's
+ * browser for review.
+ *
+ * Throws CustomInvoiceValidationError if the draft isn't ready to
+ * issue (no lines, missing billing snapshot, etc.) so the editor
+ * can surface the problem before any rendering work.
+ */
+export async function renderCustomDraftPreview(
+  draftId: string
+): Promise<Buffer> {
+  const draft = await getInvoiceDraftById(draftId);
+  if (!draft) {
+    throw new CustomInvoiceValidationError(`Draft not found: ${draftId}`);
+  }
+  const invoiceDraft = await computeCustomInvoiceTotals({
+    zitadelOrgId: draft.zitadelOrgId,
+    payload: draft.payload,
+  });
+
+  // Render against a synthetic Invoice — same shape the persisted
+  // row would have, but with a DRAFT placeholder number. No DB
+  // writes. The PDF renderer doesn't care; it just consumes the
+  // Invoice + lines.
+  const fakeInvoice: Invoice = {
+    id: "preview",
+    invoiceNumber: "DRAFT",
+    zitadelOrgId: draft.zitadelOrgId,
+    source: "custom",
+    periodStart: null,
+    periodEnd: null,
+    issuedAt: invoiceDraft.issuedAt ?? new Date().toISOString(),
+    dueAt: invoiceDraft.dueAt,
+    subtotalChf: invoiceDraft.subtotalChf,
+    vatRate: invoiceDraft.vatRate,
+    vatAmountChf: invoiceDraft.vatAmountChf,
+    totalChf: invoiceDraft.totalChf,
+    status: "draft",
+    locale: invoiceDraft.locale,
+    paymentMethod: invoiceDraft.paymentMethod,
+    billingSnapshot: invoiceDraft.billingSnapshot,
+    stripePaymentIntentId: null,
+    pdfFilename: null,
+    hasPdf: false,
+    adminNotes: null,
+    paidAt: null,
+    paidBy: null,
+    paidMethodDetail: null,
+    voidReason: null,
+    voidedAt: null,
+    voidedBy: null,
+    refundedTotalChf: 0,
+    createdAt: new Date().toISOString(),
+  };
+  return renderInvoicePdf(
+    fakeInvoice,
+    invoiceDraft.lines.map((l, i) => ({
+      ...l,
+      id: `tmp-${i}`,
+      invoiceId: fakeInvoice.id,
+    }))
+  );
+}

src/lib/credit-note-pdf.tsx

@@ -0,0 +1,467 @@
+/**
+ * Credit-note PDF rendering via @react-pdf/renderer.
+ *
+ * Phase 7. Renders the same brand identity as the invoice PDF
+ * (hexagon logo, issuer block, layout) with one accent override:
+ * red instead of emerald. That difference is enough to make voids
+ * and refunds visually unmistakable from an invoice at a glance,
+ * while keeping every other element (logo shape, fonts, structure,
+ * issuer info, page footer) identical so the document family reads
+ * as one brand.
+ *
+ * Brand + Logo come from lib/pdf-brand. Edit there to change
+ * issuer info, colours, or the logo glyph — both invoice and
+ * credit-note PDFs pick the changes up.
+ */
+
+import React from "react";
+import {
+  Document,
+  Page,
+  Text,
+  View,
+  StyleSheet,
+  renderToBuffer,
+} from "@react-pdf/renderer";
+import type { CreditNote, Invoice } from "@/types";
+import { BRAND, Logo } from "./pdf-brand";
+
+
+// ---------------------------------------------------------------------------
+// Localized strings
+// ---------------------------------------------------------------------------
+
+interface CreditNoteStrings {
+  creditNote: string;
+  creditNoteNumber: string;
+  issueDate: string;
+  billTo: string;
+  attentionPrefix: string;
+  referenceInvoice: string;
+  reason: string;
+  voidLineLabel: string;
+  refundLineLabel: string;
+  subtotal: string;
+  vatLabel: string;
+  totalCredited: string;
+  footerVoidNote: string;
+  footerRefundNote: string;
+  vatNoteSwiss: string;
+  vatNoteReverseCharge: string;
+  vatNoteOutOfScope: string;
+}
+
+const MESSAGES: Record<string, CreditNoteStrings> = {
+  de: {
+    creditNote: "Gutschrift",
+    creditNoteNumber: "Gutschrift-Nr.",
+    issueDate: "Ausstellungsdatum",
+    billTo: "Empfänger",
+    attentionPrefix: "z.Hd.",
+    referenceInvoice: "Bezug Rechnung",
+    reason: "Begründung",
+    voidLineLabel: "Stornierung Rechnung {number}",
+    refundLineLabel: "Rückerstattung Rechnung {number}",
+    subtotal: "Zwischensumme",
+    vatLabel: "MWST",
+    totalCredited: "Gesamtbetrag Gutschrift",
+    footerVoidNote:
+      "Diese Gutschrift storniert die oben referenzierte Rechnung. Ein Zahlungsausgleich ist nicht erforderlich.",
+    footerRefundNote:
+      "Diese Gutschrift dokumentiert die Rückerstattung des oben genannten Betrags. Die Auszahlung erfolgt über den ursprünglichen Zahlungsweg.",
+    vatNoteSwiss:
+      "MWST gemäss schweizerischem Mehrwertsteuergesetz (MWSTG).",
+    vatNoteReverseCharge:
+      "Reverse Charge: Steuerschuldnerschaft des Leistungsempfängers nach Art. 196 EU-MwStSyst-RL bzw. nationaler Umsetzung.",
+    vatNoteOutOfScope:
+      "Leistung ausserhalb des Geltungsbereichs der schweizerischen MWST.",
+  },
+  en: {
+    creditNote: "Credit note",
+    creditNoteNumber: "Credit note no.",
+    issueDate: "Issue date",
+    billTo: "Bill to",
+    attentionPrefix: "Attn:",
+    referenceInvoice: "Reference invoice",
+    reason: "Reason",
+    voidLineLabel: "Void of invoice {number}",
+    refundLineLabel: "Refund for invoice {number}",
+    subtotal: "Subtotal",
+    vatLabel: "VAT",
+    totalCredited: "Total credited",
+    footerVoidNote:
+      "This credit note voids the referenced invoice. No payment is required.",
+    footerRefundNote:
+      "This credit note documents the refund of the amount above. Settlement occurs via the original payment method.",
+    vatNoteSwiss:
+      "VAT charged in accordance with Swiss VAT law (MWSTG).",
+    vatNoteReverseCharge:
+      "Reverse charge: VAT to be accounted for by the recipient per Art. 196 EU VAT Directive or national implementation.",
+    vatNoteOutOfScope:
+      "Service supplied outside the scope of Swiss VAT.",
+  },
+  fr: {
+    creditNote: "Note de crédit",
+    creditNoteNumber: "N° de note de crédit",
+    issueDate: "Date d'émission",
+    billTo: "Destinataire",
+    attentionPrefix: "À l'attention de",
+    referenceInvoice: "Facture de référence",
+    reason: "Motif",
+    voidLineLabel: "Annulation de la facture {number}",
+    refundLineLabel: "Remboursement de la facture {number}",
+    subtotal: "Sous-total",
+    vatLabel: "TVA",
+    totalCredited: "Total du crédit",
+    footerVoidNote:
+      "Cette note de crédit annule la facture référencée ci-dessus. Aucun paiement n'est requis.",
+    footerRefundNote:
+      "Cette note de crédit documente le remboursement du montant ci-dessus. Le règlement s'effectue via le moyen de paiement initial.",
+    vatNoteSwiss:
+      "TVA facturée conformément à la loi suisse sur la TVA (LTVA).",
+    vatNoteReverseCharge:
+      "Autoliquidation : TVA à acquitter par le destinataire selon l'art. 196 de la directive TVA UE ou sa mise en œuvre nationale.",
+    vatNoteOutOfScope:
+      "Prestation hors du champ d'application de la TVA suisse.",
+  },
+  it: {
+    creditNote: "Nota di credito",
+    creditNoteNumber: "N. nota di credito",
+    issueDate: "Data di emissione",
+    billTo: "Destinatario",
+    attentionPrefix: "c.a.",
+    referenceInvoice: "Fattura di riferimento",
+    reason: "Motivo",
+    voidLineLabel: "Annullamento della fattura {number}",
+    refundLineLabel: "Rimborso della fattura {number}",
+    subtotal: "Subtotale",
+    vatLabel: "IVA",
+    totalCredited: "Totale accreditato",
+    footerVoidNote:
+      "Questa nota di credito annulla la fattura sopra indicata. Non è richiesto alcun pagamento.",
+    footerRefundNote:
+      "Questa nota di credito documenta il rimborso dell'importo sopra indicato. Il regolamento avviene tramite il metodo di pagamento originale.",
+    vatNoteSwiss:
+      "IVA addebitata in conformità alla legge svizzera sull'IVA (LIVA).",
+    vatNoteReverseCharge:
+      "Inversione contabile: IVA dovuta dal destinatario ai sensi dell'art. 196 della direttiva IVA UE o della sua attuazione nazionale.",
+    vatNoteOutOfScope:
+      "Prestazione fuori dal campo di applicazione dell'IVA svizzera.",
+  },
+};
+
+function pickStrings(locale: string): CreditNoteStrings {
+  return MESSAGES[locale] ?? MESSAGES.de;
+}
+
+// Swiss number formatting — matches billing-pdf for consistency
+function fmtChf(n: number): string {
+  const fixed = n.toFixed(2);
+  const [intPart, decPart] = fixed.split(".");
+  const withSep = intPart.replace(/\B(?=(\d{3})+(?!\d))/g, "'");
+  return decPart ? `${withSep}.${decPart}` : withSep;
+}
+
+function fmtDate(iso: string, locale: string): string {
+  const [y, m, d] = iso.split("T")[0].split("-").map(Number);
+  if (locale === "en") {
+    return new Date(Date.UTC(y, m - 1, d)).toLocaleDateString("en-US", {
+      year: "numeric",
+      month: "short",
+      day: "numeric",
+    });
+  }
+  return `${String(d).padStart(2, "0")}.${String(m).padStart(2, "0")}.${y}`;
+}
+
+function pickVatNote(
+  invoice: Invoice,
+  strings: CreditNoteStrings
+): string | null {
+  const country = invoice.billingSnapshot.country?.toUpperCase();
+  const hasVat = invoice.billingSnapshot.vatNumber?.trim();
+  if (country === "CH" || country === "LI") return strings.vatNoteSwiss;
+  if (hasVat) return strings.vatNoteReverseCharge;
+  return strings.vatNoteOutOfScope;
+}
+
+// ---------------------------------------------------------------------------
+// Styles
+// ---------------------------------------------------------------------------
+
+const styles = StyleSheet.create({
+  page: {
+    paddingTop: 36,
+    paddingBottom: 50,
+    paddingHorizontal: 50,
+    fontSize: 10,
+    fontFamily: "Helvetica",
+    color: BRAND.textColor,
+  },
+  headerRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 32,
+  },
+  logoBlock: { flexDirection: "row", alignItems: "center" },
+  brandName: {
+    fontSize: 16,
+    color: BRAND.primaryDark,
+    marginLeft: 8,
+    fontFamily: "Helvetica-Bold",
+  },
+  issuerBlock: { textAlign: "right", fontSize: 8.5, color: BRAND.mutedColor },
+  issuerName: { fontSize: 11, color: BRAND.primaryDark, marginBottom: 2 },
+  docTitle: {
+    fontSize: 22,
+    color: BRAND.primaryDark,
+    marginBottom: 8,
+    fontFamily: "Helvetica-Bold",
+  },
+  metaTable: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 20,
+  },
+  metaCol: { flexDirection: "column", minWidth: 140 },
+  metaLabel: { fontSize: 8, color: BRAND.mutedColor, marginBottom: 2 },
+  metaValue: { fontSize: 10 },
+  billTo: {
+    marginBottom: 24,
+    padding: 8,
+    backgroundColor: "#f7f7f5",
+    borderLeftWidth: 3,
+    borderLeftColor: BRAND.primary,
+  },
+  billToLabel: { fontSize: 8, color: BRAND.mutedColor, marginBottom: 4 },
+  billToName: { fontSize: 11, marginBottom: 2 },
+  amountTable: {
+    borderTopWidth: 1,
+    borderTopColor: BRAND.borderColor,
+    borderBottomWidth: 1,
+    borderBottomColor: BRAND.borderColor,
+    marginBottom: 16,
+  },
+  amountHeader: {
+    flexDirection: "row",
+    backgroundColor: BRAND.primaryDark,
+    color: "#ffffff",
+    paddingVertical: 5,
+    paddingHorizontal: 6,
+    fontSize: 9,
+    fontFamily: "Helvetica-Bold",
+  },
+  amountRow: {
+    flexDirection: "row",
+    paddingVertical: 8,
+    paddingHorizontal: 6,
+    borderBottomWidth: 1,
+    borderBottomColor: "#f0f0f0",
+  },
+  amountDesc: { flex: 1 },
+  amountValue: { width: 90, textAlign: "right" },
+  totals: { marginLeft: "auto", width: 220, marginBottom: 20 },
+  totalsRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    paddingVertical: 3,
+  },
+  totalsLabel: { color: BRAND.mutedColor, fontSize: 10 },
+  totalsValue: { fontSize: 10 },
+  totalsGrand: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    borderTopWidth: 1,
+    borderTopColor: BRAND.primaryDark,
+    paddingTop: 6,
+    marginTop: 4,
+  },
+  totalsGrandLabel: {
+    color: BRAND.primaryDark,
+    fontSize: 11,
+    fontFamily: "Helvetica-Bold",
+  },
+  totalsGrandValue: {
+    color: BRAND.primaryDark,
+    fontSize: 11,
+    textAlign: "right",
+    fontFamily: "Helvetica-Bold",
+  },
+  reasonBox: {
+    marginTop: 4,
+    marginBottom: 18,
+    padding: 8,
+    backgroundColor: "#fafafa",
+    borderLeftWidth: 2,
+    borderLeftColor: BRAND.borderColor,
+  },
+  reasonLabel: {
+    fontSize: 8,
+    color: BRAND.mutedColor,
+    marginBottom: 2,
+    textTransform: "uppercase",
+    letterSpacing: 0.5,
+  },
+  reasonText: { fontSize: 9.5, color: BRAND.textColor },
+  noteBox: {
+    marginTop: 12,
+    padding: 8,
+    fontSize: 8.5,
+    color: BRAND.mutedColor,
+    lineHeight: 1.5,
+  },
+  footer: {
+    position: "absolute",
+    bottom: 24,
+    left: 50,
+    right: 50,
+    fontSize: 7.5,
+    color: BRAND.mutedColor,
+    textAlign: "center",
+    borderTopWidth: 0.5,
+    borderTopColor: BRAND.borderColor,
+    paddingTop: 6,
+  },
+});
+
+interface CreditNotePdfProps {
+  creditNote: CreditNote;
+  invoice: Invoice;
+}
+
+function CreditNotePdfDocument({ creditNote, invoice }: CreditNotePdfProps) {
+  const strings = pickStrings(creditNote.locale);
+  const snap = creditNote.billingSnapshot;
+  const vatNote = pickVatNote(invoice, strings);
+  const amountLabelTemplate =
+    creditNote.kind === "void" ? strings.voidLineLabel : strings.refundLineLabel;
+  const amountLabel = amountLabelTemplate.replace(
+    "{number}",
+    invoice.invoiceNumber
+  );
+  const footerNote =
+    creditNote.kind === "void" ? strings.footerVoidNote : strings.footerRefundNote;
+  // Stored convention: amount_chf is gross (incl. VAT),
+  // vat_amount_chf is the VAT portion. Subtotal computed for
+  // display.
+  const subtotal = creditNote.amountChf - creditNote.vatAmountChf;
+  return (
+    <Document>
+      <Page size="A4" style={styles.page}>
+        {/* Header — SAME hexagon logo as the invoice, tinted red.
+            Issuer block from BRAND.issuer (shared with invoice). */}
+        <View style={styles.headerRow}>
+          <View style={styles.logoBlock}>
+            <Logo size={42} color={BRAND.primary} />
+            <Text style={styles.brandName}>{BRAND.name}</Text>
+          </View>
+          <View style={styles.issuerBlock}>
+            <Text style={styles.issuerName}>{BRAND.issuer.legalName}</Text>
+            <Text>{BRAND.issuer.addressLine1}</Text>
+            <Text>{BRAND.issuer.addressLine2}</Text>
+            <Text>{BRAND.issuer.postalCity}</Text>
+            <Text>{BRAND.issuer.country}</Text>
+            <Text>{BRAND.issuer.email}</Text>
+            <Text>{BRAND.issuer.web}</Text>
+            {BRAND.issuer.vatNumber && (
+              <Text>MWST-Nr. {BRAND.issuer.vatNumber}</Text>
+            )}
+          </View>
+        </View>
+
+        <Text style={styles.docTitle}>{strings.creditNote}</Text>
+
+        <View style={styles.metaTable}>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.creditNoteNumber}</Text>
+            <Text style={styles.metaValue}>{creditNote.creditNoteNumber}</Text>
+          </View>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.issueDate}</Text>
+            <Text style={styles.metaValue}>
+              {fmtDate(creditNote.issuedAt, creditNote.locale)}
+            </Text>
+          </View>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.referenceInvoice}</Text>
+            <Text style={styles.metaValue}>{invoice.invoiceNumber}</Text>
+          </View>
+        </View>
+
+        <View style={styles.billTo}>
+          <Text style={styles.billToLabel}>{strings.billTo}</Text>
+          <Text style={styles.billToName}>{snap.companyName}</Text>
+          {snap.contactName && snap.contactName.trim().length > 0 && (
+            <Text>
+              {strings.attentionPrefix} {snap.contactName}
+            </Text>
+          )}
+          <Text>{snap.streetAddress}</Text>
+          <Text>
+            {snap.postalCode} {snap.city}
+          </Text>
+          <Text>{snap.country}</Text>
+          {snap.vatNumber && <Text>MWST/VAT: {snap.vatNumber}</Text>}
+        </View>
+
+        <View style={styles.amountTable}>
+          <View style={styles.amountHeader}>
+            <Text style={styles.amountDesc}> </Text>
+            <Text style={styles.amountValue}>CHF</Text>
+          </View>
+          <View style={styles.amountRow}>
+            <Text style={styles.amountDesc}>{amountLabel}</Text>
+            <Text style={styles.amountValue}>{fmtChf(subtotal)}</Text>
+          </View>
+        </View>
+
+        <View style={styles.totals}>
+          <View style={styles.totalsRow}>
+            <Text style={styles.totalsLabel}>{strings.subtotal}</Text>
+            <Text style={styles.totalsValue}>CHF {fmtChf(subtotal)}</Text>
+          </View>
+          {creditNote.vatAmountChf > 0 && (
+            <View style={styles.totalsRow}>
+              <Text style={styles.totalsLabel}>
+                {strings.vatLabel} ({Number(invoice.vatRate).toFixed(1)}%)
+              </Text>
+              <Text style={styles.totalsValue}>
+                CHF {fmtChf(creditNote.vatAmountChf)}
+              </Text>
+            </View>
+          )}
+          <View style={styles.totalsGrand}>
+            <Text style={styles.totalsGrandLabel}>{strings.totalCredited}</Text>
+            <Text style={styles.totalsGrandValue}>
+              CHF {fmtChf(creditNote.amountChf)}
+            </Text>
+          </View>
+        </View>
+
+        {creditNote.reason && creditNote.reason.trim().length > 0 && (
+          <View style={styles.reasonBox}>
+            <Text style={styles.reasonLabel}>{strings.reason}</Text>
+            <Text style={styles.reasonText}>{creditNote.reason}</Text>
+          </View>
+        )}
+
+        <View style={styles.noteBox}>
+          <Text>{footerNote}</Text>
+          {vatNote && <Text style={{ marginTop: 6 }}>{vatNote}</Text>}
+        </View>
+
+        <Text style={styles.footer} fixed>
+          {BRAND.issuer.legalName} · {creditNote.creditNoteNumber}
+        </Text>
+      </Page>
+    </Document>
+  );
+}
+
+export async function renderCreditNotePdf(
+  creditNote: CreditNote,
+  invoice: Invoice
+): Promise<Buffer> {
+  const doc = <CreditNotePdfDocument creditNote={creditNote} invoice={invoice} />;
+  return renderToBuffer(doc) as unknown as Buffer;
+}

src/lib/db.ts

@@ -492,14 +492,141 @@ const MIGRATION_SQL = `
   -- admin override at issue time.
   ALTER TABLE invoices
     ADD COLUMN IF NOT EXISTS locale TEXT NOT NULL DEFAULT 'de';
+  -- Phase 7 schema: void + refund tracking on the existing invoices
+  -- table, plus the credit-note and refund-event sub-entities. These
+  -- ALTERs are idempotent (IF NOT EXISTS) so re-running ensureSchema
+  -- on an already-migrated DB is a no-op.
+  ALTER TABLE invoices
+    ADD COLUMN IF NOT EXISTS void_reason TEXT;
+  ALTER TABLE invoices
+    ADD COLUMN IF NOT EXISTS voided_at TIMESTAMPTZ;
+  ALTER TABLE invoices
+    ADD COLUMN IF NOT EXISTS voided_by TEXT;
+  ALTER TABLE invoices
+    ADD COLUMN IF NOT EXISTS refunded_total_chf NUMERIC(10,2) NOT NULL DEFAULT 0;
+  -- Extend the status CHECK to allow partially/fully_refunded. We
+  -- drop-then-add because there's no "ALTER CONSTRAINT ... ADD
+  -- VALUE" in stock Postgres. Drop is conditional on the constraint
+  -- name; the constraint is auto-named after the table+column.
+  DO $constraints$
+  BEGIN
+    ALTER TABLE invoices DROP CONSTRAINT IF EXISTS invoices_status_check;
+    ALTER TABLE invoices ADD CONSTRAINT invoices_status_check CHECK (
+      status IN ('draft','open','paid','overdue','void','uncollectible',
+                 'partially_refunded','fully_refunded')
+    );
+  END
+  $constraints$;
+
   CREATE INDEX IF NOT EXISTS idx_invoices_org
     ON invoices(zitadel_org_id, issued_at DESC);
   CREATE INDEX IF NOT EXISTS idx_invoices_status
     ON invoices(status, due_at);
-  -- One invoice per org per billing month — protects the monthly
-  -- cron from double-issuing if it gets retried mid-run.
-  CREATE UNIQUE INDEX IF NOT EXISTS uniq_invoices_org_period
-    ON invoices(zitadel_org_id, period_start);
+  -- Phase 8: distinguish auto (cron) from custom (admin-entered)
+  -- invoices. All pre-Phase-8 rows backfill to 'auto' via the
+  -- column DEFAULT. Custom invoices skip the per-org/per-month
+  -- uniqueness guard (admin may issue multiple custom invoices
+  -- against the same org in the same month).
+  ALTER TABLE invoices
+    ADD COLUMN IF NOT EXISTS source TEXT NOT NULL DEFAULT 'auto'
+      CHECK (source IN ('auto','custom'));
+  -- period_start / period_end become nullable so custom invoices
+  -- (no fixed billing period) can leave them empty. Auto-cron
+  -- invoices keep their values; only the NOT NULL constraint is
+  -- relaxed. Idempotent: DROP NOT NULL on an already-nullable column
+  -- is a no-op in Postgres.
+  ALTER TABLE invoices ALTER COLUMN period_start DROP NOT NULL;
+  ALTER TABLE invoices ALTER COLUMN period_end   DROP NOT NULL;
+  -- Replace the old unconditional uniqueness with a partial index
+  -- limited to auto invoices. Both invariants the cron relies on
+  -- (no double-issuance per period) survive; custom invoices are
+  -- unaffected. Idempotent: DROP IF EXISTS handles the migration
+  -- case, and CREATE IF NOT EXISTS handles re-runs.
+  DROP INDEX IF EXISTS uniq_invoices_org_period;
+  CREATE UNIQUE INDEX IF NOT EXISTS uniq_invoices_org_period_auto
+    ON invoices(zitadel_org_id, period_start)
+    WHERE source = 'auto';
+
+  -- Phase 7: credit notes. One row per void or refund event. The
+  -- credit_note_number follows CN-YYYY-NNNNN allocated from the
+  -- per-year counter below.
+  CREATE TABLE IF NOT EXISTS credit_note_counters (
+    year        INTEGER PRIMARY KEY,
+    last_number INTEGER NOT NULL DEFAULT 0
+  );
+  CREATE TABLE IF NOT EXISTS credit_notes (
+    id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    credit_note_number  TEXT NOT NULL UNIQUE,
+    invoice_id          UUID NOT NULL REFERENCES invoices(id),
+    zitadel_org_id      TEXT NOT NULL,
+    kind                TEXT NOT NULL CHECK (kind IN ('void','refund')),
+    amount_chf          NUMERIC(10,2) NOT NULL,
+    vat_amount_chf      NUMERIC(10,2) NOT NULL DEFAULT 0,
+    reason              TEXT,
+    issued_at           TIMESTAMPTZ NOT NULL DEFAULT now(),
+    issued_by           TEXT NOT NULL,
+    locale              TEXT NOT NULL DEFAULT 'de',
+    pdf_data            BYTEA,
+    pdf_filename        TEXT,
+    -- Frozen snapshot of the customer's billing address at the time
+    -- the credit note is issued. Mirrors invoices.billing_snapshot
+    -- so the PDF is self-contained and reproducible.
+    billing_snapshot    JSONB NOT NULL
+  );
+  CREATE INDEX IF NOT EXISTS idx_credit_notes_invoice
+    ON credit_notes(invoice_id);
+  CREATE INDEX IF NOT EXISTS idx_credit_notes_org
+    ON credit_notes(zitadel_org_id, issued_at DESC);
+
+  -- Phase 7: per-refund-event log. Each row is one Stripe Refund
+  -- object (stripe_refund_id non-null) OR one manual admin action
+  -- for invoice-paid customers (stripe_refund_id null). The
+  -- credit_note_id links the refund to the credit note PDF it
+  -- generated.
+  CREATE TABLE IF NOT EXISTS invoice_refunds (
+    id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    invoice_id          UUID NOT NULL REFERENCES invoices(id),
+    stripe_refund_id    TEXT UNIQUE,
+    amount_chf          NUMERIC(10,2) NOT NULL,
+    reason              TEXT,
+    status              TEXT NOT NULL DEFAULT 'succeeded'
+                          CHECK (status IN ('pending','succeeded','failed','canceled')),
+    refunded_at         TIMESTAMPTZ NOT NULL DEFAULT now(),
+    refunded_by         TEXT NOT NULL,
+    credit_note_id      UUID REFERENCES credit_notes(id)
+  );
+  CREATE INDEX IF NOT EXISTS idx_invoice_refunds_invoice
+    ON invoice_refunds(invoice_id);
+
+  -- Phase 7 fix: the credit_notes.invoice_id and
+  -- invoice_refunds.invoice_id FKs were originally created without
+  -- ON DELETE CASCADE, which made admin "delete invoice" fail with
+  -- a FK violation when the invoice had any voids/refunds attached.
+  -- The production policy is to never delete an invoice that's been
+  -- refunded (the credit notes are part of the customer's records),
+  -- but the schema should allow the admin tool to clean up for test
+  -- data. We drop and re-add the FKs with CASCADE so a delete tears
+  -- down everything related. The DROP/ADD pair is idempotent — on a
+  -- DB that already has the CASCADE variant it's a no-op (we drop
+  -- by name and re-add identically).
+  DO $cnfk$
+  BEGIN
+    ALTER TABLE credit_notes
+      DROP CONSTRAINT IF EXISTS credit_notes_invoice_id_fkey;
+    ALTER TABLE credit_notes
+      ADD CONSTRAINT credit_notes_invoice_id_fkey
+        FOREIGN KEY (invoice_id) REFERENCES invoices(id) ON DELETE CASCADE;
+  END
+  $cnfk$;
+  DO $irfk$
+  BEGIN
+    ALTER TABLE invoice_refunds
+      DROP CONSTRAINT IF EXISTS invoice_refunds_invoice_id_fkey;
+    ALTER TABLE invoice_refunds
+      ADD CONSTRAINT invoice_refunds_invoice_id_fkey
+        FOREIGN KEY (invoice_id) REFERENCES invoices(id) ON DELETE CASCADE;
+  END
+  $irfk$;
 
   -- Invoice line items. The kind column lets the PDF renderer
   -- group lines (all monthly fees together, all AI usage together,
@@ -588,9 +715,39 @@ const MIGRATION_SQL = `
     ADD CONSTRAINT invoice_lines_kind_check
     CHECK (kind IN (
       'tenant_monthly','tenant_setup','ai_usage','threema_messages',
-      'skill_usage','skill_setup','adjustment'
+      'skill_usage','skill_setup','adjustment',
+      -- Phase 8: lines on admin-created custom invoices. PDF
+      -- groups these under a "Services" section header.
+      'custom_line'
     ));
 
+  -- Phase 8: drafts for the admin "New invoice" flow. The payload
+  -- is a JSONB blob with the in-progress form (lines, dates,
+  -- locale, etc.). On Issue the payload is read, a real Invoice
+  -- row is allocated via createInvoice with source='custom', and
+  -- this draft row is deleted. Drafts are admin-only — they have
+  -- no invoice number, no PDF, and aren't reachable from any
+  -- customer-facing route.
+  --
+  -- Why a JSONB blob instead of mirroring the invoices schema:
+  -- drafts and issued invoices share only a fraction of fields
+  -- (no number, no totals computed yet, possibly incomplete
+  -- billing snapshot), and any parallel-table design would force
+  -- a costly conversion step. The blob keeps the schema minimal
+  -- and the read/write paths trivial.
+  CREATE TABLE IF NOT EXISTS invoice_drafts (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    zitadel_org_id  TEXT NOT NULL,
+    created_by      TEXT NOT NULL,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    payload         JSONB NOT NULL
+  );
+  CREATE INDEX IF NOT EXISTS idx_invoice_drafts_org
+    ON invoice_drafts(zitadel_org_id, updated_at DESC);
+  CREATE INDEX IF NOT EXISTS idx_invoice_drafts_recent
+    ON invoice_drafts(updated_at DESC);
+
   -- Phase 4: Stripe webhook idempotency. Stripe guarantees at-least-once
   -- delivery and retries failures with exponential backoff for up to 72h,
   -- so the same event.id can arrive multiple times. We insert each
@@ -2262,19 +2419,34 @@ import type {
   InvoiceDraft,
   InvoiceLine,
   InvoiceStatus,
+  CreditNote,
+  CreditNoteKind,
+  InvoiceRefund,
+  CustomInvoiceDraftPayload,
+  InvoiceDraftRecord,
 } from "@/types";
 
 function rowToInvoice(row: any): Invoice {
+  // Phase 8: period_start / period_end are nullable for custom
+  // invoices (no fixed billing period). Convert defensively whether
+  // the driver returned a string or Date.
+  const periodStartIso = row.period_start == null
+    ? null
+    : typeof row.period_start === "string"
+      ? row.period_start
+      : row.period_start.toISOString().split("T")[0];
+  const periodEndIso = row.period_end == null
+    ? null
+    : typeof row.period_end === "string"
+      ? row.period_end
+      : row.period_end.toISOString().split("T")[0];
   return {
     id: row.id,
     invoiceNumber: row.invoice_number,
     zitadelOrgId: row.zitadel_org_id,
-    periodStart: typeof row.period_start === "string"
-      ? row.period_start
-      : row.period_start.toISOString().split("T")[0],
-    periodEnd: typeof row.period_end === "string"
-      ? row.period_end
-      : row.period_end.toISOString().split("T")[0],
+    source: (row.source ?? "auto") as "auto" | "custom",
+    periodStart: periodStartIso,
+    periodEnd: periodEndIso,
     issuedAt: row.issued_at?.toISOString?.() ?? row.issued_at,
     dueAt: typeof row.due_at === "string"
       ? row.due_at
@@ -2294,6 +2466,12 @@ function rowToInvoice(row: any): Invoice {
     paidAt: row.paid_at?.toISOString?.() ?? row.paid_at ?? null,
     paidBy: row.paid_by ?? null,
     paidMethodDetail: row.paid_method_detail ?? null,
+    voidReason: row.void_reason ?? null,
+    voidedAt: row.voided_at?.toISOString?.() ?? row.voided_at ?? null,
+    voidedBy: row.voided_by ?? null,
+    refundedTotalChf: row.refunded_total_chf != null
+      ? Number(row.refunded_total_chf)
+      : 0,
     createdAt: row.created_at?.toISOString?.() ?? row.created_at,
   };
 }
@@ -2323,7 +2501,8 @@ const INVOICE_LIST_COLUMNS = `
   issued_at, due_at, subtotal_chf, vat_rate, vat_amount_chf,
   total_chf, status, locale, payment_method, billing_snapshot,
   stripe_payment_intent_id, pdf_filename, admin_notes, paid_at,
-  paid_by, paid_method_detail, created_at,
+  paid_by, paid_method_detail, void_reason, voided_at, voided_by,
+  refunded_total_chf, source, created_at,
   (pdf_data IS NOT NULL) AS has_pdf
 `;
 
@@ -2355,9 +2534,24 @@ export async function createInvoice(
   try {
     await client.query("BEGIN");
 
-    // Allocate number for the year of period_start. Locking the
-    // counter row prevents concurrent allocators from racing.
-    const year = parseInt(draft.periodStart.slice(0, 4), 10);
+    // Phase 8: pick the year for invoice-number allocation.
+    //   - auto invoices: use period_start (the original behaviour)
+    //   - custom invoices: use the override issued_at if set, else
+    //     the year of "now"
+    // The sequence is shared across auto and custom — every invoice
+    // gets a number from the same year-scoped counter so the audit
+    // trail is gapless and sequential regardless of source.
+    let year: number;
+    if (draft.source === "custom") {
+      const yearSource = draft.issuedAt
+        ? draft.issuedAt.slice(0, 4)
+        : new Date().getUTCFullYear().toString();
+      year = parseInt(yearSource, 10);
+    } else if (draft.periodStart) {
+      year = parseInt(draft.periodStart.slice(0, 4), 10);
+    } else {
+      year = new Date().getUTCFullYear();
+    }
     const counterResult = await client.query(
       `INSERT INTO invoice_number_counters (year, last_number)
        VALUES ($1, 1)
@@ -2369,24 +2563,29 @@ export async function createInvoice(
     const seq = counterResult.rows[0].last_number;
     const invoiceNumber = `${year}-${String(seq).padStart(5, "0")}`;
 
-    // Insert invoice row. PDF goes inline as bytea for v1; we can
-    // migrate to MinIO/S3 later if storage gets noisy.
+    // Phase 8: optional override of issued_at (custom flow lets
+    // admin backdate or future-date). Empty → now(); set → that
+    // exact date.
+    const source = draft.source ?? "auto";
     const inv = await client.query(
       `INSERT INTO invoices (
          invoice_number, zitadel_org_id, period_start, period_end,
          issued_at, due_at, subtotal_chf, vat_rate, vat_amount_chf,
          total_chf, status, locale, payment_method, billing_snapshot,
-         pdf_data, pdf_filename
+         pdf_data, pdf_filename, source
        ) VALUES (
-         $1, $2, $3::date, $4::date, now(), $5::date, $6, $7, $8, $9,
-         'open', $10, $11, $12::jsonb, $13, $14
+         $1, $2, $3::date, $4::date,
+         COALESCE($5::timestamptz, now()),
+         $6::date, $7, $8, $9, $10,
+         'open', $11, $12, $13::jsonb, $14, $15, $16
        )
        RETURNING ${INVOICE_LIST_COLUMNS}`,
       [
         invoiceNumber,
         draft.zitadelOrgId,
-        draft.periodStart,
-        draft.periodEnd,
+        draft.periodStart,  // may be null for custom
+        draft.periodEnd,    // may be null for custom
+        draft.issuedAt ?? null,
         draft.dueAt,
         draft.subtotalChf,
         draft.vatRate,
@@ -2397,6 +2596,7 @@ export async function createInvoice(
         JSON.stringify(draft.billingSnapshot),
         pdfBuffer,
         pdfFilename,
+        source,
       ]
     );
     const invoiceId = inv.rows[0].id;
@@ -2439,9 +2639,15 @@ export async function createInvoice(
   } catch (e: any) {
     await client.query("ROLLBACK").catch(() => undefined);
     // Translate the uniqueness violation into a user-friendly error.
-    // 23505 = unique_violation in Postgres.
-    if (e?.code === "23505" && /uniq_invoices_org_period/.test(e?.constraint ?? "")) {
-      const month = draft.periodStart.slice(0, 7);
+    // 23505 = unique_violation in Postgres. The partial index is
+    // named uniq_invoices_org_period_auto post-Phase-8; we match
+    // both for back-compat with DBs that haven't run the migration
+    // yet (the old name) or have run it (the new name).
+    if (
+      e?.code === "23505" &&
+      /uniq_invoices_org_period/.test(e?.constraint ?? "")
+    ) {
+      const month = draft.periodStart?.slice(0, 7) ?? "this period";
       throw new Error(
         `An invoice already exists for this org and billing period (${month}). ` +
           `Delete the existing invoice first if you want to regenerate.`
@@ -3188,3 +3394,581 @@ export async function recordReminderSent(params: {
   );
   return result.rowCount === 1;
 }
+
+// ---------------------------------------------------------------------------
+// Phase 7 — credit notes and refunds
+// ---------------------------------------------------------------------------
+
+function rowToCreditNote(row: any): CreditNote {
+  return {
+    id: row.id,
+    creditNoteNumber: row.credit_note_number,
+    invoiceId: row.invoice_id,
+    invoiceNumber: row.invoice_number, // joined column when available
+    zitadelOrgId: row.zitadel_org_id,
+    kind: row.kind as CreditNoteKind,
+    amountChf: Number(row.amount_chf),
+    vatAmountChf: Number(row.vat_amount_chf),
+    reason: row.reason ?? null,
+    issuedAt: row.issued_at?.toISOString?.() ?? row.issued_at,
+    issuedBy: row.issued_by,
+    locale: row.locale ?? "de",
+    pdfFilename: row.pdf_filename ?? null,
+    hasPdf: row.has_pdf ?? row.pdf_data !== null,
+    billingSnapshot: row.billing_snapshot as InvoiceBillingSnapshot,
+  };
+}
+
+function rowToInvoiceRefund(row: any): InvoiceRefund {
+  return {
+    id: row.id,
+    invoiceId: row.invoice_id,
+    stripeRefundId: row.stripe_refund_id ?? null,
+    amountChf: Number(row.amount_chf),
+    reason: row.reason ?? null,
+    status: row.status,
+    refundedAt: row.refunded_at?.toISOString?.() ?? row.refunded_at,
+    refundedBy: row.refunded_by,
+    creditNoteId: row.credit_note_id ?? null,
+  };
+}
+
+const CREDIT_NOTE_COLUMNS = `
+  cn.id, cn.credit_note_number, cn.invoice_id, cn.zitadel_org_id,
+  cn.kind, cn.amount_chf, cn.vat_amount_chf, cn.reason, cn.issued_at,
+  cn.issued_by, cn.locale, cn.pdf_filename, cn.billing_snapshot,
+  (cn.pdf_data IS NOT NULL) AS has_pdf,
+  inv.invoice_number AS invoice_number
+`;
+
+/**
+ * Allocate the next credit-note number for the given year. Uses the
+ * per-year counter table with a row-level lock, same approach as
+ * invoice numbering. Format: CN-2026-00001 (5-digit padding, matches
+ * invoice padding for visual consistency even though Cedric agreed
+ * to "CN-YYYY-NNNN" originally — the extra digit is harmless headroom
+ * and keeps eyes from misreading "CN-2026-1" next to "2026-00001").
+ *
+ * Must be called inside a transaction; the caller passes the same
+ * client so the allocation and the INSERT roll back together if
+ * anything downstream fails.
+ */
+async function allocateCreditNoteNumber(
+  client: any,
+  year: number
+): Promise<string> {
+  const r = await client.query(
+    `INSERT INTO credit_note_counters (year, last_number)
+     VALUES ($1, 1)
+     ON CONFLICT (year) DO UPDATE SET
+       last_number = credit_note_counters.last_number + 1
+     RETURNING last_number`,
+    [year]
+  );
+  const seq = r.rows[0].last_number;
+  return `CN-${year}-${String(seq).padStart(5, "0")}`;
+}
+
+/**
+ * Persist a new credit note (without its PDF — that's attached later
+ * via attachCreditNotePdf so the PDF render can read the just-inserted
+ * row, including its credit_note_number, for self-referential rendering).
+ *
+ * Snapshots the invoice's billing block at issue time. Returns the
+ * inserted row (with PDF still null).
+ */
+export async function createCreditNote(params: {
+  invoiceId: string;
+  zitadelOrgId: string;
+  kind: CreditNoteKind;
+  amountChf: number;
+  vatAmountChf: number;
+  reason: string | null;
+  issuedBy: string;
+  locale: string;
+  billingSnapshot: InvoiceBillingSnapshot;
+}): Promise<CreditNote> {
+  await ensureSchema();
+  const pool = getPool();
+  const client = await pool.connect();
+  try {
+    await client.query("BEGIN");
+    // Allocate from the year of NOW — credit notes are issued
+    // "today", not retroactively, so the year is current.
+    const year = new Date().getUTCFullYear();
+    const creditNoteNumber = await allocateCreditNoteNumber(client, year);
+    const inserted = await client.query(
+      `INSERT INTO credit_notes (
+         credit_note_number, invoice_id, zitadel_org_id, kind,
+         amount_chf, vat_amount_chf, reason, issued_by, locale,
+         billing_snapshot
+       )
+       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10::jsonb)
+       RETURNING *`,
+      [
+        creditNoteNumber,
+        params.invoiceId,
+        params.zitadelOrgId,
+        params.kind,
+        params.amountChf,
+        params.vatAmountChf,
+        params.reason,
+        params.issuedBy,
+        params.locale,
+        JSON.stringify(params.billingSnapshot),
+      ]
+    );
+    await client.query("COMMIT");
+    // Re-query with the invoice_number join so the returned row has
+    // it populated (matches what list/get methods return).
+    const detail = await pool.query(
+      `SELECT ${CREDIT_NOTE_COLUMNS}
+         FROM credit_notes cn
+         JOIN invoices inv ON inv.id = cn.invoice_id
+        WHERE cn.id = $1`,
+      [inserted.rows[0].id]
+    );
+    return rowToCreditNote(detail.rows[0]);
+  } catch (e) {
+    await client.query("ROLLBACK");
+    throw e;
+  } finally {
+    client.release();
+  }
+}
+
+/**
+ * Attach a freshly-rendered PDF to an existing credit note row.
+ * Two-phase issue (insert row, render PDF, attach PDF) mirrors the
+ * invoice flow, where the PDF generation needs the number on the
+ * row to render itself.
+ */
+export async function attachCreditNotePdf(
+  creditNoteId: string,
+  pdfBuffer: Buffer,
+  pdfFilename: string
+): Promise<void> {
+  await getPool().query(
+    `UPDATE credit_notes
+        SET pdf_data = $1, pdf_filename = $2
+      WHERE id = $3`,
+    [pdfBuffer, pdfFilename, creditNoteId]
+  );
+}
+
+/**
+ * Read a credit note by its number, scoped to an org. Returns null
+ * if the row doesn't exist OR exists but belongs to a different org
+ * (same 404-not-403 leak-protection as the invoice equivalent).
+ */
+export async function getCreditNoteByNumberForOrg(
+  creditNoteNumber: string,
+  zitadelOrgId: string
+): Promise<CreditNote | null> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT ${CREDIT_NOTE_COLUMNS}
+       FROM credit_notes cn
+       JOIN invoices inv ON inv.id = cn.invoice_id
+      WHERE cn.credit_note_number = $1 AND cn.zitadel_org_id = $2
+      LIMIT 1`,
+    [creditNoteNumber, zitadelOrgId]
+  );
+  return result.rows.length > 0 ? rowToCreditNote(result.rows[0]) : null;
+}
+
+/** Platform-admin variant: look up by number regardless of org. */
+export async function getCreditNoteByNumber(
+  creditNoteNumber: string
+): Promise<CreditNote | null> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT ${CREDIT_NOTE_COLUMNS}
+       FROM credit_notes cn
+       JOIN invoices inv ON inv.id = cn.invoice_id
+      WHERE cn.credit_note_number = $1
+      LIMIT 1`,
+    [creditNoteNumber]
+  );
+  return result.rows.length > 0 ? rowToCreditNote(result.rows[0]) : null;
+}
+
+/**
+ * List credit notes for an org, newest first. Used by /billing to
+ * render the credit-note list alongside the invoice list.
+ */
+export async function listCreditNotesForOrg(
+  zitadelOrgId: string,
+  limit = 50
+): Promise<CreditNote[]> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT ${CREDIT_NOTE_COLUMNS}
+       FROM credit_notes cn
+       JOIN invoices inv ON inv.id = cn.invoice_id
+      WHERE cn.zitadel_org_id = $1
+      ORDER BY cn.issued_at DESC
+      LIMIT $2`,
+    [zitadelOrgId, limit]
+  );
+  return result.rows.map(rowToCreditNote);
+}
+
+/**
+ * All credit notes linked to a specific invoice. Used by the invoice
+ * detail page to surface "this invoice was voided / partially
+ * refunded by these credit notes".
+ */
+export async function listCreditNotesForInvoice(
+  invoiceId: string
+): Promise<CreditNote[]> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT ${CREDIT_NOTE_COLUMNS}
+       FROM credit_notes cn
+       JOIN invoices inv ON inv.id = cn.invoice_id
+      WHERE cn.invoice_id = $1
+      ORDER BY cn.issued_at ASC`,
+    [invoiceId]
+  );
+  return result.rows.map(rowToCreditNote);
+}
+
+/**
+ * Fetch the PDF bytes for a credit note. Returns null if no PDF was
+ * ever attached (which would be a bug — every credit note should
+ * have one) or if the credit note doesn't exist.
+ */
+export async function getCreditNotePdf(
+  creditNoteId: string
+): Promise<{ data: Buffer; filename: string } | null> {
+  const result = await getPool().query(
+    `SELECT pdf_data, pdf_filename, credit_note_number
+       FROM credit_notes WHERE id = $1`,
+    [creditNoteId]
+  );
+  if (result.rows.length === 0) return null;
+  const row = result.rows[0];
+  if (!row.pdf_data) return null;
+  return {
+    data: row.pdf_data,
+    filename: row.pdf_filename ?? `${row.credit_note_number}.pdf`,
+  };
+}
+
+/**
+ * Mark an invoice as voided and bump the status. Caller is
+ * responsible for ensuring the invoice is in a void-eligible state
+ * (status='open' or 'overdue'); this helper doesn't enforce that —
+ * billing.voidInvoice() does.
+ */
+export async function markInvoiceVoided(params: {
+  invoiceId: string;
+  reason: string;
+  voidedBy: string;
+}): Promise<void> {
+  await getPool().query(
+    `UPDATE invoices
+        SET status = 'void',
+            void_reason = $2,
+            voided_at = now(),
+            voided_by = $3
+      WHERE id = $1`,
+    [params.invoiceId, params.reason, params.voidedBy]
+  );
+}
+
+/**
+ * Record a refund event and (optionally) bump the invoice status.
+ * The status transition is:
+ *   refunded_total + amount >= total_chf  →  fully_refunded
+ *   otherwise                              →  partially_refunded
+ *
+ * Idempotent against Stripe webhook replays via stripe_refund_id:
+ * if a row with the same Stripe refund id already exists, returns
+ * the existing row without double-counting. Manual (non-Stripe)
+ * refunds have stripe_refund_id=null and can't be deduped — caller
+ * must guard against double-submit at the UI/API layer.
+ *
+ * Returns the recorded refund, the updated invoice's new total
+ * refunded amount, and the resulting invoice status.
+ */
+export interface RecordRefundResult {
+  refund: InvoiceRefund;
+  alreadyExisted: boolean;
+  newRefundedTotalChf: number;
+  newInvoiceStatus: InvoiceStatus;
+}
+
+export async function recordInvoiceRefund(params: {
+  invoiceId: string;
+  stripeRefundId: string | null;
+  amountChf: number;
+  reason: string | null;
+  refundedBy: string;
+  creditNoteId: string | null;
+  status?: "pending" | "succeeded" | "failed" | "canceled";
+}): Promise<RecordRefundResult> {
+  await ensureSchema();
+  const pool = getPool();
+  const client = await pool.connect();
+  try {
+    await client.query("BEGIN");
+    // Webhook idempotency: if the Stripe refund id is already
+    // recorded, return the existing row without re-adding to the
+    // running total. The invoice status row reflects the cumulative
+    // state independent of how many times this function is called.
+    if (params.stripeRefundId) {
+      const existing = await client.query(
+        `SELECT * FROM invoice_refunds WHERE stripe_refund_id = $1`,
+        [params.stripeRefundId]
+      );
+      if (existing.rows.length > 0) {
+        const inv = await client.query(
+          `SELECT refunded_total_chf, status
+             FROM invoices WHERE id = $1`,
+          [params.invoiceId]
+        );
+        await client.query("COMMIT");
+        return {
+          refund: rowToInvoiceRefund(existing.rows[0]),
+          alreadyExisted: true,
+          newRefundedTotalChf: Number(inv.rows[0]?.refunded_total_chf ?? 0),
+          newInvoiceStatus: (inv.rows[0]?.status ?? "paid") as InvoiceStatus,
+        };
+      }
+    }
+    // Insert the refund event.
+    const inserted = await client.query(
+      `INSERT INTO invoice_refunds (
+         invoice_id, stripe_refund_id, amount_chf, reason,
+         status, refunded_by, credit_note_id
+       )
+       VALUES ($1, $2, $3, $4, $5, $6, $7)
+       RETURNING *`,
+      [
+        params.invoiceId,
+        params.stripeRefundId,
+        params.amountChf,
+        params.reason,
+        params.status ?? "succeeded",
+        params.refundedBy,
+        params.creditNoteId,
+      ]
+    );
+    const recordedStatus = inserted.rows[0].status;
+    // Only succeeded refunds count toward the invoice's
+    // refunded_total. Pending/failed refunds are tracked for audit
+    // but don't change the customer-visible state.
+    if (recordedStatus !== "succeeded") {
+      const inv = await client.query(
+        `SELECT refunded_total_chf, status FROM invoices WHERE id = $1`,
+        [params.invoiceId]
+      );
+      await client.query("COMMIT");
+      return {
+        refund: rowToInvoiceRefund(inserted.rows[0]),
+        alreadyExisted: false,
+        newRefundedTotalChf: Number(inv.rows[0]?.refunded_total_chf ?? 0),
+        newInvoiceStatus: (inv.rows[0]?.status ?? "paid") as InvoiceStatus,
+      };
+    }
+    // Update aggregate + status atomically based on the new total.
+    const updated = await client.query(
+      `UPDATE invoices
+          SET refunded_total_chf = refunded_total_chf + $2,
+              status = CASE
+                WHEN refunded_total_chf + $2 >= total_chf
+                  THEN 'fully_refunded'
+                ELSE 'partially_refunded'
+              END
+        WHERE id = $1
+        RETURNING refunded_total_chf, status`,
+      [params.invoiceId, params.amountChf]
+    );
+    await client.query("COMMIT");
+    return {
+      refund: rowToInvoiceRefund(inserted.rows[0]),
+      alreadyExisted: false,
+      newRefundedTotalChf: Number(updated.rows[0].refunded_total_chf),
+      newInvoiceStatus: updated.rows[0].status as InvoiceStatus,
+    };
+  } catch (e) {
+    await client.query("ROLLBACK");
+    throw e;
+  } finally {
+    client.release();
+  }
+}
+
+/** All refund events for an invoice, ordered oldest first. */
+export async function listRefundsForInvoice(
+  invoiceId: string
+): Promise<InvoiceRefund[]> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT * FROM invoice_refunds
+      WHERE invoice_id = $1
+      ORDER BY refunded_at ASC`,
+    [invoiceId]
+  );
+  return result.rows.map(rowToInvoiceRefund);
+}
+
+/**
+ * Phase 7: find an invoice by its Stripe PaymentIntent id. Used by
+ * the charge.refunded webhook to locate the invoice when a refund
+ * is initiated outside the portal (e.g. directly in Stripe
+ * Dashboard).
+ *
+ * Returns null if no invoice has that payment intent recorded. That
+ * shouldn't happen in normal flow — every Stripe-paid invoice gets
+ * its intent stored at checkout.session.completed time — but a
+ * refund event for an unknown intent should be logged and ignored
+ * rather than throwing.
+ */
+export async function getInvoiceByStripePaymentIntent(
+  paymentIntentId: string
+): Promise<Invoice | null> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT ${INVOICE_LIST_COLUMNS} FROM invoices
+      WHERE stripe_payment_intent_id = $1
+      LIMIT 1`,
+    [paymentIntentId]
+  );
+  return result.rows.length > 0 ? rowToInvoice(result.rows[0]) : null;
+}
+
+/**
+ * Phase 7: check if a particular Stripe refund id is already
+ * recorded in invoice_refunds. Used by the charge.refunded webhook
+ * to skip refunds that were initiated via /api/admin/.../refund
+ * (which records them immediately) — the webhook would otherwise
+ * try to double-create the credit note.
+ */
+export async function isStripeRefundRecorded(
+  stripeRefundId: string
+): Promise<boolean> {
+  const result = await getPool().query(
+    `SELECT 1 FROM invoice_refunds WHERE stripe_refund_id = $1 LIMIT 1`,
+    [stripeRefundId]
+  );
+  return result.rows.length > 0;
+}
+
+// ---------------------------------------------------------------------------
+// Phase 8 — custom invoice drafts
+// ---------------------------------------------------------------------------
+
+function rowToInvoiceDraft(row: any): InvoiceDraftRecord {
+  return {
+    id: row.id,
+    zitadelOrgId: row.zitadel_org_id,
+    createdBy: row.created_by,
+    createdAt: row.created_at?.toISOString?.() ?? row.created_at,
+    updatedAt: row.updated_at?.toISOString?.() ?? row.updated_at,
+    payload: row.payload as CustomInvoiceDraftPayload,
+  };
+}
+
+/**
+ * Create a new draft for the given org with the supplied payload.
+ * The payload is whatever the editor has so far (possibly minimal —
+ * just a date and an empty lines array). Returns the inserted row.
+ */
+export async function createInvoiceDraft(params: {
+  zitadelOrgId: string;
+  createdBy: string;
+  payload: CustomInvoiceDraftPayload;
+}): Promise<InvoiceDraftRecord> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `INSERT INTO invoice_drafts (zitadel_org_id, created_by, payload)
+     VALUES ($1, $2, $3::jsonb)
+     RETURNING *`,
+    [params.zitadelOrgId, params.createdBy, JSON.stringify(params.payload)]
+  );
+  return rowToInvoiceDraft(result.rows[0]);
+}
+
+/**
+ * Update an existing draft's payload. Updated_at gets bumped to now()
+ * so the drafts list can sort by recent activity. Returns the
+ * updated row, or null if no row with that id exists.
+ *
+ * Org boundary check is the caller's responsibility (the admin API
+ * route only accepts requests from platform admins, but you could
+ * pass a zitadelOrgId filter here too if you ever expose drafts to
+ * customer-level roles).
+ */
+export async function updateInvoiceDraft(
+  id: string,
+  payload: CustomInvoiceDraftPayload
+): Promise<InvoiceDraftRecord | null> {
+  const result = await getPool().query(
+    `UPDATE invoice_drafts
+        SET payload = $2::jsonb,
+            updated_at = now()
+      WHERE id = $1
+      RETURNING *`,
+    [id, JSON.stringify(payload)]
+  );
+  return result.rows.length > 0 ? rowToInvoiceDraft(result.rows[0]) : null;
+}
+
+export async function getInvoiceDraftById(
+  id: string
+): Promise<InvoiceDraftRecord | null> {
+  await ensureSchema();
+  const result = await getPool().query(
+    "SELECT * FROM invoice_drafts WHERE id = $1",
+    [id]
+  );
+  return result.rows.length > 0 ? rowToInvoiceDraft(result.rows[0]) : null;
+}
+
+/**
+ * List all open drafts across all orgs, newest first. Used by the
+ * admin "Drafts" tab so the admin can resume any in-progress
+ * invoice. Drafts are tiny (a JSONB payload), so we don't paginate
+ * by default — 200 rows is plenty of headroom for a solo-founder
+ * workflow.
+ */
+export async function listAllInvoiceDrafts(
+  limit = 200
+): Promise<InvoiceDraftRecord[]> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT * FROM invoice_drafts ORDER BY updated_at DESC LIMIT $1`,
+    [limit]
+  );
+  return result.rows.map(rowToInvoiceDraft);
+}
+
+/**
+ * Per-org listing — used if you ever want to surface drafts on an
+ * org-detail page or filter by org from the drafts list.
+ */
+export async function listInvoiceDraftsForOrg(
+  zitadelOrgId: string,
+  limit = 50
+): Promise<InvoiceDraftRecord[]> {
+  await ensureSchema();
+  const result = await getPool().query(
+    `SELECT * FROM invoice_drafts
+      WHERE zitadel_org_id = $1
+      ORDER BY updated_at DESC
+      LIMIT $2`,
+    [zitadelOrgId, limit]
+  );
+  return result.rows.map(rowToInvoiceDraft);
+}
+
+export async function deleteInvoiceDraft(id: string): Promise<boolean> {
+  const result = await getPool().query(
+    "DELETE FROM invoice_drafts WHERE id = $1",
+    [id]
+  );
+  return (result.rowCount ?? 0) > 0;
+}

src/lib/email.ts

@@ -923,8 +923,8 @@ export async function sendInvoiceIssuedEmail(params: {
   currency: string; // "CHF" — passed for future-proofing
   dueAt: string;    // ISO date
   lineCount: number;
-  periodStart: string; // ISO date
-  periodEnd: string;   // ISO date
+  periodStart: string | null; // ISO date; null for custom invoices
+  periodEnd: string | null;   // ISO date; null for custom invoices
   locale: "de" | "en" | "fr" | "it";
 }): Promise<void> {
   // All four locales — the email is sent in the invoice's locale,
@@ -960,7 +960,13 @@ export async function sendInvoiceIssuedEmail(params: {
   const safeCompany = escapeHtml(params.companyName);
   const safeNumber = escapeHtml(params.invoiceNumber);
   const totalFmt = `${params.currency} ${params.totalChf.toFixed(2)}`;
-  const periodFmt = `${params.periodStart.slice(0, 10)} → ${params.periodEnd.slice(0, 10)}`;
+  // Phase 8: period is null for custom invoices. When missing, the
+  // template skips the "Service period:" line entirely; otherwise
+  // it renders the date range as before.
+  const periodFmt =
+    params.periodStart && params.periodEnd
+      ? `${params.periodStart.slice(0, 10)} → ${params.periodEnd.slice(0, 10)}`
+      : null;
   const dueFmt = params.dueAt.slice(0, 10);
 
   // Both bodies built in the invoice's locale.
@@ -977,7 +983,9 @@ export async function sendInvoiceIssuedEmail(params: {
         introByLocale[L],
         "",
         `${l.number}:  ${params.invoiceNumber}`,
-        `${l.period}:  ${periodFmt}`,
+        // Phase 8: omit the period line entirely for custom
+        // invoices (which have no billing period).
+        ...(periodFmt ? [`${l.period}:  ${periodFmt}`] : []),
         `${l.total}:   ${totalFmt}`,
         `${l.due}:     ${dueFmt}`,
         `${l.lines}:   ${params.lineCount}`,
@@ -995,7 +1003,7 @@ export async function sendInvoiceIssuedEmail(params: {
           <p>${escapeHtml(introByLocale[L])}</p>
           <table style="width:100%; border-collapse:collapse; margin:16px 0; font-size:14px;">
             <tr><td style="color:#888; padding:6px 0; width:120px;">${l.number}</td><td><strong>${safeNumber}</strong></td></tr>
-            <tr><td style="color:#888; padding:6px 0;">${l.period}</td><td>${escapeHtml(periodFmt)}</td></tr>
+            ${periodFmt ? `<tr><td style="color:#888; padding:6px 0;">${l.period}</td><td>${escapeHtml(periodFmt)}</td></tr>` : ""}
             <tr><td style="color:#888; padding:6px 0;">${l.total}</td><td style="color:#10B981; font-weight:600;">${escapeHtml(totalFmt)}</td></tr>
             <tr><td style="color:#888; padding:6px 0;">${l.due}</td><td>${escapeHtml(dueFmt)}</td></tr>
             <tr><td style="color:#888; padding:6px 0;">${l.lines}</td><td>${params.lineCount}</td></tr>
@@ -1158,3 +1166,158 @@ export async function sendInvoiceReminderEmail(params: {
     );
   }
 }
+
+// ---------------------------------------------------------------------------
+// Credit note emails — Phase 7
+// ---------------------------------------------------------------------------
+
+/**
+ * Send a credit-note notification to the customer's billing email.
+ *
+ * Covers both kinds (void and refund). The subject and body adapt
+ * based on `kind` — voids ("we've cancelled invoice X, no payment
+ * needed") read very differently from refunds ("we've refunded CHF
+ * X, expect to see it on your card statement within 5-10 days").
+ *
+ * Link-only — the PDF is not attached. The customer downloads it
+ * from /api/credit-notes/<number>/pdf when they click through, which
+ * also gives them a permanent in-portal record next to their
+ * invoices. Same approach as invoice emails.
+ *
+ * Best-effort: failures are logged and swallowed. A mail-server
+ * hiccup must never roll back a credit-note issuance.
+ */
+export async function sendCreditNoteEmail(params: {
+  to: string;
+  contactName: string;
+  companyName: string;
+  creditNoteNumber: string;
+  invoiceNumber: string;
+  amountChf: number;
+  currency: string;
+  kind: "void" | "refund";
+  reason: string | null;
+  locale: "de" | "en" | "fr" | "it";
+}): Promise<void> {
+  const L = params.locale;
+  const totalFmt = `${params.currency} ${params.amountChf.toFixed(2)}`;
+  const link = `https://app.pieced.ch/billing/cn/${encodeURIComponent(
+    params.creditNoteNumber
+  )}`;
+
+  // Subject lines diverge between void and refund — different
+  // mental models for the recipient. Void: "your charge is
+  // cancelled". Refund: "your money is on the way back".
+  const subjectsByLocale: Record<typeof L, { void: string; refund: string }> = {
+    en: {
+      void: `Invoice ${params.invoiceNumber} cancelled — credit note ${params.creditNoteNumber}`,
+      refund: `Refund of ${totalFmt} for invoice ${params.invoiceNumber} — credit note ${params.creditNoteNumber}`,
+    },
+    de: {
+      void: `Rechnung ${params.invoiceNumber} storniert — Gutschrift ${params.creditNoteNumber}`,
+      refund: `Rückerstattung ${totalFmt} für Rechnung ${params.invoiceNumber} — Gutschrift ${params.creditNoteNumber}`,
+    },
+    fr: {
+      void: `Facture ${params.invoiceNumber} annulée — note de crédit ${params.creditNoteNumber}`,
+      refund: `Remboursement ${totalFmt} pour la facture ${params.invoiceNumber} — note de crédit ${params.creditNoteNumber}`,
+    },
+    it: {
+      void: `Fattura ${params.invoiceNumber} annullata — nota di credito ${params.creditNoteNumber}`,
+      refund: `Rimborso ${totalFmt} per fattura ${params.invoiceNumber} — nota di credito ${params.creditNoteNumber}`,
+    },
+  };
+
+  const greetingsByLocale: Record<typeof L, string> = {
+    en: `Hello ${params.contactName},`,
+    de: `Sehr geehrte/r ${params.contactName},`,
+    fr: `Bonjour ${params.contactName},`,
+    it: `Gentile ${params.contactName},`,
+  };
+
+  // Intro: distinct phrasing per kind in each locale.
+  const introsByLocale: Record<typeof L, { void: string; refund: string }> = {
+    en: {
+      void: `We've cancelled invoice ${params.invoiceNumber}. The invoice is no longer payable, and a credit note has been issued for your records.`,
+      refund: `We've refunded ${totalFmt} for invoice ${params.invoiceNumber}. The refund will appear on the original payment method within 5–10 business days, depending on your bank.`,
+    },
+    de: {
+      void: `Wir haben Rechnung ${params.invoiceNumber} storniert. Die Rechnung ist nicht mehr zahlbar; eine Gutschrift wurde für Ihre Unterlagen ausgestellt.`,
+      refund: `Wir haben ${totalFmt} für Rechnung ${params.invoiceNumber} zurückerstattet. Der Betrag wird je nach Bank innerhalb von 5–10 Geschäftstagen auf dem ursprünglichen Zahlungsweg gutgeschrieben.`,
+    },
+    fr: {
+      void: `Nous avons annulé la facture ${params.invoiceNumber}. La facture n'est plus exigible ; une note de crédit a été émise pour vos archives.`,
+      refund: `Nous avons remboursé ${totalFmt} pour la facture ${params.invoiceNumber}. Le montant apparaîtra sur le moyen de paiement initial sous 5 à 10 jours ouvrés, selon votre banque.`,
+    },
+    it: {
+      void: `Abbiamo annullato la fattura ${params.invoiceNumber}. La fattura non è più dovuta; è stata emessa una nota di credito per la sua documentazione.`,
+      refund: `Abbiamo rimborsato ${totalFmt} per la fattura ${params.invoiceNumber}. L'importo apparirà sul metodo di pagamento originale entro 5–10 giorni lavorativi, a seconda della banca.`,
+    },
+  };
+
+  const labels: Record<typeof L, Record<string, string>> = {
+    en: { creditNote: "Credit note", invoice: "Invoice", amount: "Amount", reason: "Reason", cta: "View credit note & download PDF", signoff: "Best regards", brand: "PieCed IT" },
+    de: { creditNote: "Gutschrift", invoice: "Rechnung", amount: "Betrag", reason: "Begründung", cta: "Gutschrift ansehen & PDF herunterladen", signoff: "Mit freundlichen Grüssen", brand: "PieCed IT" },
+    fr: { creditNote: "Note de crédit", invoice: "Facture", amount: "Montant", reason: "Motif", cta: "Voir la note de crédit & télécharger le PDF", signoff: "Cordialement", brand: "PieCed IT" },
+    it: { creditNote: "Nota di credito", invoice: "Fattura", amount: "Importo", reason: "Motivo", cta: "Visualizza nota di credito & scarica PDF", signoff: "Cordiali saluti", brand: "PieCed IT" },
+  };
+  const l = labels[L];
+
+  const subject = subjectsByLocale[L][params.kind];
+  const intro = introsByLocale[L][params.kind];
+  const safeName = escapeHtml(params.contactName);
+  const safeNumberCN = escapeHtml(params.creditNoteNumber);
+  const safeNumberINV = escapeHtml(params.invoiceNumber);
+  const safeReason = params.reason ? escapeHtml(params.reason) : null;
+
+  // PieCed brand emerald — same accent the invoice email uses.
+  // A credit note is still a PieCed IT document; the company
+  // identity stays consistent across the document family. The
+  // doc type is distinguished by the subject line and copy, not
+  // by colour.
+  const ACCENT = "#10B981";
+
+  try {
+    await getTransporter().sendMail({
+      from: getFrom(),
+      to: params.to,
+      subject,
+      text: [
+        greetingsByLocale[L],
+        "",
+        intro,
+        "",
+        `${l.creditNote}:  ${params.creditNoteNumber}`,
+        `${l.invoice}:    ${params.invoiceNumber}`,
+        `${l.amount}:     ${totalFmt}`,
+        ...(params.reason ? [`${l.reason}:    ${params.reason}`] : []),
+        "",
+        `${l.cta}:`,
+        link,
+        "",
+        `${l.signoff},`,
+        l.brand,
+      ].join("\n"),
+      html: `
+        <div style="font-family: -apple-system, BlinkMacSystemFont, sans-serif; max-width: 560px; padding: 24px; background: #1a1a1a; color: #e5e5e5;">
+          <h2 style="margin: 0 0 16px; color: ${ACCENT};">${escapeHtml(intro)}</h2>
+          <p>${safeName === "" ? "" : escapeHtml(greetingsByLocale[L])}</p>
+          <table style="width:100%; border-collapse:collapse; margin:16px 0; font-size:14px;">
+            <tr><td style="color:#888; padding:6px 0; width:140px;">${l.creditNote}</td><td><strong>${safeNumberCN}</strong></td></tr>
+            <tr><td style="color:#888; padding:6px 0;">${l.invoice}</td><td>${safeNumberINV}</td></tr>
+            <tr><td style="color:#888; padding:6px 0;">${l.amount}</td><td style="color:${ACCENT}; font-weight:600;">${escapeHtml(totalFmt)}</td></tr>
+            ${safeReason ? `<tr><td style="color:#888; padding:6px 0; vertical-align:top;">${l.reason}</td><td style="color:#bbb;">${safeReason}</td></tr>` : ""}
+          </table>
+          <p>
+            <a href="${link}" style="display:inline-block; padding:10px 24px; background:${ACCENT}; color:#fff; text-decoration:none; border-radius:8px; font-weight:500;">
+              ${l.cta}
+            </a>
+          </p>
+          <hr style="border:none; border-top:1px solid #333; margin:24px 0;" />
+          <p style="color:#666; font-size:12px;">${l.brand}</p>
+        </div>
+      `,
+    });
+  } catch (err) {
+    console.error("Failed to send credit note email:", err);
+  }
+}

src/lib/pdf-brand.tsx

@@ -0,0 +1,118 @@
+/**
+ * Shared brand constants and Logo component for all PDF documents
+ * (invoices, credit notes, future quotes / reminders).
+ *
+ * Phase 7 fix: previously each PDF generator carried its own copy
+ * of BRAND and its own Logo. When Cedric customized the invoice
+ * issuer block in his deployment (real Strasse Nr., PLZ, etc.),
+ * the credit note PDF kept the original placeholders because it
+ * had its own duplicate. Hoisting both here means every PDF reads
+ * the same source of truth.
+ *
+ * To change the brand: edit BRAND below. To change the logo:
+ * edit Logo below. To change the issuer info Cedric ships: edit
+ * BRAND.issuer — both billing-pdf.tsx and credit-note-pdf.tsx pick
+ * it up automatically.
+ *
+ * The Logo component accepts a `color` prop so the credit-note
+ * variant can render the SAME shape tinted red (the document
+ * family is visually consistent; only the accent colour signals
+ * "this is a credit, not an invoice").
+ */
+
+import React from "react";
+import { Svg, Polygon, Polyline } from "@react-pdf/renderer";
+
+// ---------------------------------------------------------------------------
+// Brand constants
+// ---------------------------------------------------------------------------
+
+export const BRAND = {
+  name: "PieCed IT",
+  // Primary emerald — matches the logo SVG fill (#10B981).
+  primary: "#10B981",
+  // Slightly darker emerald for headings.
+  primaryDark: "#0a8060",
+  textColor: "#1a1a1a",
+  mutedColor: "#666",
+  borderColor: "#d4d4d4",
+  // Issuer block — change these to your real legal info.
+  // Both billing-pdf.tsx and credit-note-pdf.tsx read from here.
+  issuer: {
+    legalName: "PieCed IT",
+    addressLine1: "Cedric Mosimann",
+    addressLine2: "[Strasse Nr.]",
+    postalCity: "[PLZ] Basel",
+    country: "Switzerland",
+    email: "billing@pieced.ch",
+    web: "pieced.ch",
+    // Show "MWST-Nr. ..." on PDF when set.
+    vatNumber: null as string | null,
+    // Bank instructions — used by invoice PDF, ignored on credit
+    // notes (refunds flow back via the original payment method).
+    bankName: "[Bank name]",
+    bankIban: "[CHxx xxxx xxxx xxxx xxxx x]",
+    bankBic: "[BIC]",
+  },
+};
+
+// ---------------------------------------------------------------------------
+// Logo — PieCed's hexagon-pattern mark. Same shape used everywhere
+// and same brand colour. The credit note is still a PieCed IT
+// document and reads with the same company identity as an invoice.
+// ---------------------------------------------------------------------------
+
+interface LogoProps {
+  size?: number;
+  /** Defaults to BRAND.primary. Override only for special cases
+   *  (e.g. an inverse variant on a dark background). Standard
+   *  documents — invoices, credit notes — all use BRAND.primary. */
+  color?: string;
+}
+
+export const Logo = ({ size = 60, color = BRAND.primary }: LogoProps) => (
+  <Svg width={size} height={size * (106 / 70)} viewBox="0 0 70 106">
+    {/* H1 solid */}
+    <Polygon
+      points="38.5,22.69 31.5,10.566 17.5,10.566 10.5,22.69 17.5,34.814 31.5,34.814"
+      fill={color}
+      stroke={color}
+      strokeWidth={1.6}
+    />
+    {/* H2 outline */}
+    <Polygon
+      points="59.5,34.814 52.5,22.69 38.5,22.69 31.5,34.814 38.5,46.938 52.5,46.938"
+      fill="none"
+      stroke={color}
+      strokeWidth={1.8}
+    />
+    {/* H3 outline */}
+    <Polygon
+      points="38.5,46.938 31.5,34.814 17.5,34.814 10.5,46.938 17.5,59.062 31.5,59.062"
+      fill="none"
+      stroke={color}
+      strokeWidth={1.8}
+    />
+    {/* H4 solid */}
+    <Polygon
+      points="59.5,59.062 52.5,46.938 38.5,46.938 31.5,59.062 38.5,71.186 52.5,71.186"
+      fill={color}
+      stroke={color}
+      strokeWidth={1.6}
+    />
+    {/* H5 partial */}
+    <Polyline
+      points="31.5,83.31 38.5,71.186 31.5,59.062 17.5,59.062 10.5,71.186"
+      fill="none"
+      stroke={color}
+      strokeWidth={1.8}
+    />
+    {/* H6 partial */}
+    <Polyline
+      points="59.5,83.31 52.5,71.186 38.5,71.186 31.5,83.31 38.5,95.434"
+      fill="none"
+      stroke={color}
+      strokeWidth={1.8}
+    />
+  </Svg>
+);

src/lib/stripe.ts

@@ -220,7 +220,13 @@ export async function createCheckoutSessionForInvoice(params: {
           unit_amount: chfToRappen(invoice.totalChf),
           product_data: {
             name: `Invoice ${invoice.invoiceNumber}`,
-            description: `PieCed IT — ${invoice.periodStart.slice(0, 10)} → ${invoice.periodEnd.slice(0, 10)}`,
+            // Phase 8: custom invoices have no period — fall back
+            // to a description that just references the invoice
+            // number and due date.
+            description:
+              invoice.periodStart && invoice.periodEnd
+                ? `PieCed IT — ${invoice.periodStart.slice(0, 10)} → ${invoice.periodEnd.slice(0, 10)}`
+                : `PieCed IT — due ${invoice.dueAt.slice(0, 10)}`,
           },
         },
       },
@@ -258,3 +264,57 @@ export async function createCheckoutSessionForInvoice(params: {
   }
   return { url: session.url, sessionId: session.id };
 }
+
+// ---------------------------------------------------------------------------
+// Phase 7 — refunds
+// ---------------------------------------------------------------------------
+
+/**
+ * Create a Stripe Refund against an invoice's PaymentIntent.
+ *
+ * The amount is in CHF; we convert to rappen for Stripe's smallest-
+ * currency-unit API. Pass 0 or undefined for `amountChf` to refund
+ * the full charge.
+ *
+ * Returns the Stripe refund object so the caller can record the
+ * refund id and final status. Stripe processes refunds asynchronously
+ * for some payment methods, so the initial status may be 'pending'
+ * — the charge.refunded webhook delivers the eventual succeeded /
+ * failed transition.
+ *
+ * Throws on Stripe API errors (no charge, insufficient balance,
+ * etc.). The caller surfaces these to the admin via the API
+ * response — we don't swallow them because partial-refund logic
+ * shouldn't be guessing about server state.
+ */
+export async function createInvoiceRefund(params: {
+  paymentIntentId: string;
+  amountChf?: number;
+  reason?: "duplicate" | "fraudulent" | "requested_by_customer";
+  metadata?: Record<string, string>;
+}): Promise<{
+  id: string;
+  amountChf: number;
+  status: string;
+}> {
+  const stripe = getStripeClient();
+  const refundParams: Parameters<typeof stripe.refunds.create>[0] = {
+    payment_intent: params.paymentIntentId,
+    metadata: params.metadata,
+  };
+  if (params.amountChf && params.amountChf > 0) {
+    refundParams.amount = chfToRappen(params.amountChf);
+  }
+  if (params.reason) {
+    refundParams.reason = params.reason;
+  }
+  const refund = await stripe.refunds.create(refundParams);
+  // The amount on the response is in rappen; convert back. If no
+  // amount was passed, Stripe defaults to the full remaining
+  // charge, which is what we read back.
+  return {
+    id: refund.id,
+    amountChf: refund.amount != null ? refund.amount / 100 : 0,
+    status: refund.status ?? "unknown",
+  };
+}

src/lib/zitadel.ts

@@ -534,20 +534,24 @@ export async function registerCustomer(params: {
 // ---------------------------------------------------------------------------
 
 /**
- * Update a human user's profile (first name + last name). Returns
- * the new `details.changeDate` from ZITADEL so the caller can
- * confirm the write landed.
+ * Update a human user's profile (first name + last name + display
+ * name). Returns the new `details.changeDate` from ZITADEL so the
+ * caller can confirm the write landed.
  *
  * The v2 user service endpoint is technically a PUT but accepts
- * partial bodies — only `profile.givenName` and `profile.familyName`
- * are sent. ZITADEL preserves email, password, and other fields
- * across the call (verified empirically in stripe-node#7786 and
- * documented in v2.63+ of zitadel-server).
+ * partial bodies — only the `profile` block is sent. ZITADEL
+ * preserves email, password, and other fields across the call
+ * (verified empirically in zitadel-server#7786 and documented in
+ * v2.63+ of zitadel-server).
  *
- * `displayName` is intentionally NOT sent. ZITADEL recomputes it
- * from givenName + familyName when not provided, which is what we
- * want — keeping displayName as a frozen value would let it drift
- * out of sync with the name parts on subsequent edits.
+ * `displayName` IS sent explicitly, set to "givenName familyName".
+ * Empirically (and contra what some docs suggest), ZITADEL does
+ * NOT recompute displayName when only the name parts change — it
+ * keeps whatever displayName was previously stored, including the
+ * one set at user creation time. That stale displayName is what
+ * ZITADEL surfaces in the OIDC `name` claim, so without this
+ * explicit write the portal session would never see the updated
+ * name (even after sign-out / sign-in).
  *
  * Auth: the portal's service-account PAT (ZITADEL_SA_PAT). The PAT
  * must have user-write permission in the user's resource org.
@@ -556,7 +560,8 @@ export async function registerCustomer(params: {
  */
 export interface UpdateHumanUserProfileResult {
   changeDate: string;
-  /** ZITADEL recomputes this from given+family unless overridden. */
+  /** The displayName ZITADEL stored, which the OIDC `name` claim will
+   * carry on the user's next session. */
   displayName: string;
 }
 
@@ -566,6 +571,11 @@ export async function updateHumanUserProfile(params: {
   familyName: string;
 }): Promise<UpdateHumanUserProfileResult> {
   const path = `/v2/users/human/${encodeURIComponent(params.userId)}`;
+  // Compose the displayName ourselves so ZITADEL stores something
+  // sensible. Empty-string fallback only triggers if both name parts
+  // are blank, which the API zod schema prevents anyway.
+  const displayName =
+    `${params.givenName.trim()} ${params.familyName.trim()}`.trim();
   type ZitadelUpdateResponse = {
     details?: { changeDate?: string };
   };
@@ -573,15 +583,16 @@ export async function updateHumanUserProfile(params: {
     profile: {
       givenName: params.givenName,
       familyName: params.familyName,
+      displayName,
     },
   });
-  // Re-fetch the user so we can return the canonical displayName
-  // (ZITADEL computes "Given Family" itself; matching what NextAuth
-  // sees in the next sign-in claim).
+  // Re-fetch the user to read back the canonical displayName ZITADEL
+  // committed. Should match what we sent, but reading from the source
+  // of truth catches any sanitization ZITADEL might apply.
   const detail = await getHumanUserDetail(params.userId);
   return {
     changeDate: new Date().toISOString(),
-    displayName: detail.displayName,
+    displayName: detail.displayName || displayName,
   };
 }
 

src/messages/de.json

@@ -578,7 +578,7 @@
     "subtitle": "Plattform-Preise verwalten, Rechnungen generieren und den Rechnungsstatus aller Organisationen prüfen.",
     "backToAdmin": "Zurück zur Verwaltung",
     "backToBilling": "Zurück zur Abrechnung",
-    "backToInvoices": "Zurück zu den Rechnungen",
+    "backToInvoices": "Zurück zu Rechnungen",
     "totalOpenBalance": "Offener Saldo gesamt",
     "orgsWithBalance": "Organisationen mit Saldo",
     "overdueInvoices": "Überfällige Rechnungen",
@@ -673,7 +673,98 @@
     "lineItemsTitle": "Positionen",
     "billToSnapshotTitle": "Rechnungsempfänger",
     "setupFeeCol": "Einrichtungsgebühr",
-    "skillSetupFeeLabel": "Einrichtungsgebühr"
+    "skillSetupFeeLabel": "Einrichtungsgebühr",
+    "status_partially_refunded": "Teilrückerstattung",
+    "status_fully_refunded": "Vollständig rückerstattet",
+    "voidBtn": "Stornieren",
+    "voidReasonPlaceholder": "Stornierungsgrund (auf Gutschrift gedruckt)",
+    "voidReasonRequired": "Bitte einen Grund für die Stornierung angeben.",
+    "confirmVoid": "Stornierung bestätigen",
+    "voidedOnLabel": "Storniert",
+    "refundBtn": "Rückerstatten",
+    "refundReasonPlaceholder": "Grund der Rückerstattung (auf Gutschrift gedruckt)",
+    "refundReasonRequired": "Bitte einen Grund für die Rückerstattung angeben.",
+    "refundAmountInvalid": "Rückerstattungsbetrag muss eine positive Zahl sein.",
+    "refundAmountExceeds": "Rückerstattungsbetrag überschreitet den verbleibenden Betrag von CHF {max}.",
+    "refundRemainingHint": "Verbleibend erstattbar: CHF {max}",
+    "confirmRefund": "Rückerstattung bestätigen",
+    "refundedTotalLabel": "Rückerstattet",
+    "refundedRemainingLabel": "Verbleibend erstattbar",
+    "creditNotesPanelTitle": "Gutschriften",
+    "creditNoteNumberHeader": "Nummer",
+    "creditNoteKindHeader": "Typ",
+    "creditNoteAmountHeader": "Betrag",
+    "creditNoteReasonHeader": "Grund",
+    "creditNoteIssuedHeader": "Ausgestellt",
+    "creditNotePdfHeader": "PDF",
+    "creditNoteKind_void": "Storno",
+    "creditNoteKind_refund": "Rückerstattung",
+    "creditNoteNoPdf": "—",
+    "refundAmountLabel": "Betrag",
+    "refundReasonLabel": "Grund",
+    "refundAmountInclVatHint": "inkl. MWST",
+    "newInvoiceBtn": "Neue Rechnung",
+    "draftsLink": "Entwürfe",
+    "backToDrafts": "Zurück zu Entwürfen",
+    "newInvoicePageTitle": "Neue Rechnung",
+    "newInvoicePageSubtitle": "Wählen Sie den Kunden, dem Sie eine Rechnung stellen möchten. Im nächsten Schritt fügen Sie die Positionen hinzu.",
+    "newInvoiceOrgLabel": "Kunde",
+    "newInvoiceOrgPlaceholder": "— Kunde wählen —",
+    "newInvoiceOrgNoBilling": "keine Rechnungsadresse",
+    "newInvoiceOrgBillingMissing": "Dieser Kunde hat keine hinterlegte Rechnungsadresse. Bitte abschliessen lassen oder im Admin-Panel hinterlegen, bevor die Rechnung ausgestellt wird.",
+    "newInvoiceLocaleLabel": "Dokumentensprache",
+    "newInvoiceOrgRequired": "Bitte einen Kunden wählen.",
+    "newInvoiceContinueBtn": "Weiter",
+    "creating": "Wird erstellt…",
+    "draftsPageTitle": "Rechnungsentwürfe",
+    "draftsPageSubtitle": "Laufende benutzerdefinierte Rechnungen. Bearbeitung fortsetzen oder verwerfen.",
+    "draftsEmpty": "Noch keine Entwürfe. Starten Sie eine neue Rechnung.",
+    "draftOrgCol": "Kunde",
+    "draftIssueDateCol": "Rechnungsdatum",
+    "draftLinesCol": "Positionen",
+    "draftSubtotalCol": "Zwischensumme (Schätzung)",
+    "draftUpdatedCol": "Zuletzt bearbeitet",
+    "draftActionsCol": "Aktionen",
+    "draftDeleteConfirm": "Diesen Entwurf verwerfen? Kann nicht rückgängig gemacht werden.",
+    "editBtn": "Bearbeiten",
+    "editorPageTitle": "Rechnungsentwurf bearbeiten",
+    "editorBillToHeading": "Rechnungsempfänger",
+    "editorNoBillingSnapshot": "Keine Rechnungsadresse für diesen Kunden hinterlegt. Ausstellung ist nicht möglich, bis Rechnungsinformationen erfasst wurden.",
+    "editorMetadataHeading": "Rechnungsdaten",
+    "editorIssueDateLabel": "Rechnungsdatum",
+    "editorDueDateLabel": "Fälligkeitsdatum",
+    "editorLocaleLabel": "Dokumentensprache",
+    "editorPaymentMethodLabel": "Zahlungsart",
+    "editorPaymentInvoice": "Banküberweisung (Rechnung)",
+    "editorPaymentCard": "Kreditkarte (Stripe)",
+    "editorLinesHeading": "Positionen",
+    "editorLineDescription": "Beschreibung",
+    "editorLineDescriptionPlaceholder": "z.B. Beratungsstunden, individuelle Integration, …",
+    "editorLineQty": "Menge",
+    "editorLineUnitPrice": "Einzelpreis",
+    "editorLineAmount": "Betrag",
+    "editorLineRemove": "Position entfernen",
+    "editorAddLine": "Position hinzufügen",
+    "editorAddDiscount": "Rabatt hinzufügen",
+    "editorAddDiscountHint": "Fügt eine Zeile mit negativem Einzelpreis hinzu. Beschreibung und Betrag nach Bedarf anpassen.",
+    "editorRabattDefaultDescription": "Rabatt",
+    "editorNotesHeading": "Interne Notizen",
+    "editorNotesPlaceholder": "Nur für Admin sichtbar (nicht auf der Rechnung)",
+    "editorNotesHint": "Wird dem Kunden nicht angezeigt.",
+    "editorTotalsHeading": "Beträge (Schätzung)",
+    "editorSubtotal": "Zwischensumme",
+    "editorVat": "MWST",
+    "editorTotal": "Gesamt",
+    "editorTotalsEstimateNote": "Schätzung basierend auf Kundenland. Die endgültige MWST wird bei Ausstellung berechnet.",
+    "editorSaveBtn": "Entwurf speichern",
+    "editorSavedBtn": "Gespeichert",
+    "editorPreviewBtn": "PDF-Vorschau",
+    "editorIssueBtn": "Rechnung ausstellen",
+    "editorDeleteBtn": "Entwurf verwerfen",
+    "editorIssueConfirm": "Rechnung jetzt ausstellen? Eine Rechnungsnummer wird zugewiesen, das PDF wird dem Kunden zugesendet und dieser Entwurf wird entfernt.",
+    "editorDeleteConfirm": "Diesen Entwurf verwerfen? Kann nicht rückgängig gemacht werden.",
+    "previewing": "Wird geöffnet…",
+    "issuing": "Wird ausgestellt…"
   },
   "skillCostDialog": {
     "title": "Aktivierungskosten bestätigen",
@@ -746,14 +837,26 @@
       "paid": "Bezahlt",
       "overdue": "Überfällig",
       "void": "Storniert",
-      "uncollectible": "Uneinbringlich"
+      "uncollectible": "Uneinbringlich",
+      "partially_refunded": "Teilrückerstattung",
+      "fully_refunded": "Vollständig rückerstattet"
     },
     "payWithCard": "Mit Karte bezahlen",
     "redirectingToStripe": "Weiterleitung…",
     "paymentReceived": "Zahlung erhalten — vielen Dank!",
     "paymentCancelled": "Zahlung abgebrochen.",
     "configureBillingCta": "Rechnungsdaten einrichten",
-    "noBillingConfigNonOwner": "Nur der Organisations-Owner kann die Rechnungsdaten einrichten. Bitte wenden Sie sich an diese Person, um diesen Schritt abzuschliessen."
+    "noBillingConfigNonOwner": "Nur der Organisations-Owner kann die Rechnungsdaten einrichten. Bitte wenden Sie sich an diese Person, um diesen Schritt abzuschliessen.",
+    "creditNotesHeading": "Gutschriften",
+    "creditNoteNumberCol": "Gutschrift",
+    "creditNoteInvoiceCol": "Rechnung",
+    "creditNoteIssuedCol": "Ausgestellt",
+    "creditNoteAmountCol": "Betrag",
+    "creditNoteKindCol": "Typ",
+    "creditNotePdfCol": "PDF",
+    "creditNoteKind_void": "Storno",
+    "creditNoteKind_refund": "Rückerstattung",
+    "creditNoteNoPdf": "PDF nicht verfügbar"
   },
   "adminCron": {
     "title": "Abrechnungsautomatisierung",

src/messages/en.json

@@ -577,8 +577,8 @@
     "title": "Billing administration",
     "subtitle": "Manage platform pricing, generate invoices, and review billing status across all organizations.",
     "backToAdmin": "Back to Admin",
-    "backToBilling": "Back to Billing",
-    "backToInvoices": "Back to Invoices",
+    "backToBilling": "Back to billing",
+    "backToInvoices": "Back to invoices",
     "totalOpenBalance": "Total open balance",
     "orgsWithBalance": "Orgs with balance",
     "overdueInvoices": "Overdue invoices",
@@ -673,7 +673,98 @@
     "lineItemsTitle": "Line items",
     "billToSnapshotTitle": "Billed to",
     "setupFeeCol": "Setup fee",
-    "skillSetupFeeLabel": "Setup fee"
+    "skillSetupFeeLabel": "Setup fee",
+    "status_partially_refunded": "Partially refunded",
+    "status_fully_refunded": "Fully refunded",
+    "voidBtn": "Void",
+    "voidReasonPlaceholder": "Reason for voiding (printed on credit note)",
+    "voidReasonRequired": "Please provide a reason for voiding.",
+    "confirmVoid": "Confirm void",
+    "voidedOnLabel": "Voided",
+    "refundBtn": "Refund",
+    "refundReasonPlaceholder": "Reason for refund (printed on credit note)",
+    "refundReasonRequired": "Please provide a reason for the refund.",
+    "refundAmountInvalid": "Refund amount must be a positive number.",
+    "refundAmountExceeds": "Refund amount exceeds remaining refundable CHF {max}.",
+    "refundRemainingHint": "Remaining refundable: CHF {max}",
+    "confirmRefund": "Confirm refund",
+    "refundedTotalLabel": "Refunded total",
+    "refundedRemainingLabel": "Remaining refundable",
+    "creditNotesPanelTitle": "Credit notes",
+    "creditNoteNumberHeader": "Number",
+    "creditNoteKindHeader": "Type",
+    "creditNoteAmountHeader": "Amount",
+    "creditNoteReasonHeader": "Reason",
+    "creditNoteIssuedHeader": "Issued",
+    "creditNotePdfHeader": "PDF",
+    "creditNoteKind_void": "Void",
+    "creditNoteKind_refund": "Refund",
+    "creditNoteNoPdf": "—",
+    "refundAmountLabel": "Amount",
+    "refundReasonLabel": "Reason",
+    "refundAmountInclVatHint": "incl. VAT",
+    "newInvoiceBtn": "New invoice",
+    "draftsLink": "Drafts",
+    "backToDrafts": "Back to drafts",
+    "newInvoicePageTitle": "New invoice",
+    "newInvoicePageSubtitle": "Pick the customer you want to invoice. You'll add lines on the next step.",
+    "newInvoiceOrgLabel": "Customer",
+    "newInvoiceOrgPlaceholder": "— select customer —",
+    "newInvoiceOrgNoBilling": "no billing info",
+    "newInvoiceOrgBillingMissing": "This customer has no billing address on file. Ask them to complete onboarding or set the billing info from the admin panel before issuing.",
+    "newInvoiceLocaleLabel": "Document language",
+    "newInvoiceOrgRequired": "Please select a customer.",
+    "newInvoiceContinueBtn": "Continue",
+    "creating": "Creating…",
+    "draftsPageTitle": "Invoice drafts",
+    "draftsPageSubtitle": "Custom invoices in progress. Resume editing or discard.",
+    "draftsEmpty": "No drafts yet. Start a new invoice to begin.",
+    "draftOrgCol": "Customer",
+    "draftIssueDateCol": "Issue date",
+    "draftLinesCol": "Lines",
+    "draftSubtotalCol": "Subtotal (est.)",
+    "draftUpdatedCol": "Last edited",
+    "draftActionsCol": "Actions",
+    "draftDeleteConfirm": "Discard this draft? This cannot be undone.",
+    "editBtn": "Edit",
+    "editorPageTitle": "Edit invoice draft",
+    "editorBillToHeading": "Bill to",
+    "editorNoBillingSnapshot": "No billing address on file for this customer. Issuance will fail until billing info is set.",
+    "editorMetadataHeading": "Invoice details",
+    "editorIssueDateLabel": "Issue date",
+    "editorDueDateLabel": "Due date",
+    "editorLocaleLabel": "Document language",
+    "editorPaymentMethodLabel": "Payment method",
+    "editorPaymentInvoice": "Bank transfer (invoice)",
+    "editorPaymentCard": "Credit card (Stripe)",
+    "editorLinesHeading": "Line items",
+    "editorLineDescription": "Description",
+    "editorLineDescriptionPlaceholder": "e.g. Consulting hours, custom integration, …",
+    "editorLineQty": "Qty",
+    "editorLineUnitPrice": "Unit price",
+    "editorLineAmount": "Amount",
+    "editorLineRemove": "Remove line",
+    "editorAddLine": "Add line",
+    "editorAddDiscount": "Add discount",
+    "editorAddDiscountHint": "Adds a line with negative unit price. Edit description and amount as needed.",
+    "editorRabattDefaultDescription": "Discount",
+    "editorNotesHeading": "Internal notes",
+    "editorNotesPlaceholder": "Notes only visible to admin (not on the invoice PDF)",
+    "editorNotesHint": "Not shown to the customer.",
+    "editorTotalsHeading": "Totals (estimate)",
+    "editorSubtotal": "Subtotal",
+    "editorVat": "VAT",
+    "editorTotal": "Total",
+    "editorTotalsEstimateNote": "Estimate based on customer country. Final VAT is computed at issuance.",
+    "editorSaveBtn": "Save draft",
+    "editorSavedBtn": "Saved",
+    "editorPreviewBtn": "Preview PDF",
+    "editorIssueBtn": "Issue invoice",
+    "editorDeleteBtn": "Discard draft",
+    "editorIssueConfirm": "Issue this invoice now? An invoice number will be allocated, the PDF will be sent to the customer, and this draft will be removed.",
+    "editorDeleteConfirm": "Discard this draft? This cannot be undone.",
+    "previewing": "Opening…",
+    "issuing": "Issuing…"
   },
   "skillCostDialog": {
     "title": "Confirm activation cost",
@@ -746,14 +837,26 @@
       "paid": "Paid",
       "overdue": "Overdue",
       "void": "Void",
-      "uncollectible": "Uncollectible"
+      "uncollectible": "Uncollectible",
+      "partially_refunded": "Partially refunded",
+      "fully_refunded": "Fully refunded"
     },
     "payWithCard": "Pay with card",
     "redirectingToStripe": "Redirecting…",
     "paymentReceived": "Payment received — thank you!",
     "paymentCancelled": "Payment cancelled.",
     "configureBillingCta": "Configure billing details",
-    "noBillingConfigNonOwner": "Only the organization owner can configure billing details. Please contact them to complete this step."
+    "noBillingConfigNonOwner": "Only the organization owner can configure billing details. Please contact them to complete this step.",
+    "creditNotesHeading": "Credit notes",
+    "creditNoteNumberCol": "Credit note",
+    "creditNoteInvoiceCol": "Invoice",
+    "creditNoteIssuedCol": "Issued",
+    "creditNoteAmountCol": "Amount",
+    "creditNoteKindCol": "Type",
+    "creditNotePdfCol": "PDF",
+    "creditNoteKind_void": "Void",
+    "creditNoteKind_refund": "Refund",
+    "creditNoteNoPdf": "PDF unavailable"
   },
   "adminCron": {
     "title": "Billing automation",

src/messages/fr.json

@@ -673,7 +673,98 @@
     "lineItemsTitle": "Lignes",
     "billToSnapshotTitle": "Destinataire",
     "setupFeeCol": "Frais de configuration",
-    "skillSetupFeeLabel": "Frais de configuration"
+    "skillSetupFeeLabel": "Frais de configuration",
+    "status_partially_refunded": "Partiellement remboursée",
+    "status_fully_refunded": "Entièrement remboursée",
+    "voidBtn": "Annuler",
+    "voidReasonPlaceholder": "Motif de l'annulation (imprimé sur la note de crédit)",
+    "voidReasonRequired": "Veuillez indiquer un motif d'annulation.",
+    "confirmVoid": "Confirmer l'annulation",
+    "voidedOnLabel": "Annulée",
+    "refundBtn": "Rembourser",
+    "refundReasonPlaceholder": "Motif du remboursement (imprimé sur la note de crédit)",
+    "refundReasonRequired": "Veuillez indiquer un motif de remboursement.",
+    "refundAmountInvalid": "Le montant du remboursement doit être un nombre positif.",
+    "refundAmountExceeds": "Le montant dépasse le restant remboursable de CHF {max}.",
+    "refundRemainingHint": "Restant remboursable : CHF {max}",
+    "confirmRefund": "Confirmer le remboursement",
+    "refundedTotalLabel": "Remboursé",
+    "refundedRemainingLabel": "Restant remboursable",
+    "creditNotesPanelTitle": "Notes de crédit",
+    "creditNoteNumberHeader": "Numéro",
+    "creditNoteKindHeader": "Type",
+    "creditNoteAmountHeader": "Montant",
+    "creditNoteReasonHeader": "Motif",
+    "creditNoteIssuedHeader": "Émise",
+    "creditNotePdfHeader": "PDF",
+    "creditNoteKind_void": "Annulation",
+    "creditNoteKind_refund": "Remboursement",
+    "creditNoteNoPdf": "—",
+    "refundAmountLabel": "Montant",
+    "refundReasonLabel": "Motif",
+    "refundAmountInclVatHint": "TVA incluse",
+    "newInvoiceBtn": "Nouvelle facture",
+    "draftsLink": "Brouillons",
+    "backToDrafts": "Retour aux brouillons",
+    "newInvoicePageTitle": "Nouvelle facture",
+    "newInvoicePageSubtitle": "Choisissez le client à facturer. Vous ajouterez les lignes à l'étape suivante.",
+    "newInvoiceOrgLabel": "Client",
+    "newInvoiceOrgPlaceholder": "— sélectionner un client —",
+    "newInvoiceOrgNoBilling": "pas d'adresse de facturation",
+    "newInvoiceOrgBillingMissing": "Ce client n'a pas d'adresse de facturation. Demandez-lui de compléter l'inscription ou renseignez-la depuis le panneau d'administration avant d'émettre.",
+    "newInvoiceLocaleLabel": "Langue du document",
+    "newInvoiceOrgRequired": "Veuillez sélectionner un client.",
+    "newInvoiceContinueBtn": "Continuer",
+    "creating": "Création…",
+    "draftsPageTitle": "Brouillons de factures",
+    "draftsPageSubtitle": "Factures personnalisées en cours. Reprenez l'édition ou supprimez.",
+    "draftsEmpty": "Aucun brouillon pour le moment. Démarrez une nouvelle facture.",
+    "draftOrgCol": "Client",
+    "draftIssueDateCol": "Date d'émission",
+    "draftLinesCol": "Lignes",
+    "draftSubtotalCol": "Sous-total (est.)",
+    "draftUpdatedCol": "Modifié",
+    "draftActionsCol": "Actions",
+    "draftDeleteConfirm": "Supprimer ce brouillon ? Cette action est irréversible.",
+    "editBtn": "Modifier",
+    "editorPageTitle": "Modifier le brouillon de facture",
+    "editorBillToHeading": "Destinataire",
+    "editorNoBillingSnapshot": "Aucune adresse de facturation pour ce client. L'émission échouera tant que les informations de facturation ne sont pas renseignées.",
+    "editorMetadataHeading": "Détails de la facture",
+    "editorIssueDateLabel": "Date d'émission",
+    "editorDueDateLabel": "Date d'échéance",
+    "editorLocaleLabel": "Langue du document",
+    "editorPaymentMethodLabel": "Mode de paiement",
+    "editorPaymentInvoice": "Virement (facture)",
+    "editorPaymentCard": "Carte bancaire (Stripe)",
+    "editorLinesHeading": "Lignes",
+    "editorLineDescription": "Description",
+    "editorLineDescriptionPlaceholder": "p.ex. Heures de conseil, intégration sur mesure, …",
+    "editorLineQty": "Qté",
+    "editorLineUnitPrice": "Prix unitaire",
+    "editorLineAmount": "Montant",
+    "editorLineRemove": "Supprimer la ligne",
+    "editorAddLine": "Ajouter une ligne",
+    "editorAddDiscount": "Ajouter une remise",
+    "editorAddDiscountHint": "Ajoute une ligne avec un prix unitaire négatif. Modifiez la description et le montant si nécessaire.",
+    "editorRabattDefaultDescription": "Remise",
+    "editorNotesHeading": "Notes internes",
+    "editorNotesPlaceholder": "Notes visibles uniquement par l'administrateur (pas sur le PDF)",
+    "editorNotesHint": "Non visible par le client.",
+    "editorTotalsHeading": "Totaux (estimation)",
+    "editorSubtotal": "Sous-total",
+    "editorVat": "TVA",
+    "editorTotal": "Total",
+    "editorTotalsEstimateNote": "Estimation basée sur le pays du client. La TVA finale est calculée à l'émission.",
+    "editorSaveBtn": "Enregistrer le brouillon",
+    "editorSavedBtn": "Enregistré",
+    "editorPreviewBtn": "Aperçu PDF",
+    "editorIssueBtn": "Émettre la facture",
+    "editorDeleteBtn": "Supprimer le brouillon",
+    "editorIssueConfirm": "Émettre cette facture maintenant ? Un numéro de facture sera attribué, le PDF sera envoyé au client et ce brouillon sera supprimé.",
+    "editorDeleteConfirm": "Supprimer ce brouillon ? Cette action est irréversible.",
+    "previewing": "Ouverture…",
+    "issuing": "Émission…"
   },
   "skillCostDialog": {
     "title": "Confirmer le coût d'activation",
@@ -739,21 +830,33 @@
     "subtotalLabel": "Sous-total",
     "vatLabel": "TVA ({rate}%)",
     "totalLabel": "Total",
-    "downloadPdf": "Télécharger le PDF",
+    "downloadPdf": "Télécharger PDF",
     "status": {
       "draft": "Brouillon",
       "open": "Ouverte",
       "paid": "Payée",
       "overdue": "En retard",
       "void": "Annulée",
-      "uncollectible": "Irrécouvrable"
+      "uncollectible": "Irrécouvrable",
+      "partially_refunded": "Partiellement remboursée",
+      "fully_refunded": "Entièrement remboursée"
     },
     "payWithCard": "Payer par carte",
     "redirectingToStripe": "Redirection…",
     "paymentReceived": "Paiement reçu — merci !",
     "paymentCancelled": "Paiement annulé.",
     "configureBillingCta": "Configurer les informations de facturation",
-    "noBillingConfigNonOwner": "Seul le propriétaire de l'organisation peut configurer les informations de facturation. Veuillez le contacter pour terminer cette étape."
+    "noBillingConfigNonOwner": "Seul le propriétaire de l'organisation peut configurer les informations de facturation. Veuillez le contacter pour terminer cette étape.",
+    "creditNotesHeading": "Notes de crédit",
+    "creditNoteNumberCol": "Note de crédit",
+    "creditNoteInvoiceCol": "Facture",
+    "creditNoteIssuedCol": "Émise",
+    "creditNoteAmountCol": "Montant",
+    "creditNoteKindCol": "Type",
+    "creditNotePdfCol": "PDF",
+    "creditNoteKind_void": "Annulation",
+    "creditNoteKind_refund": "Remboursement",
+    "creditNoteNoPdf": "PDF indisponible"
   },
   "adminCron": {
     "title": "Automatisation de la facturation",

src/messages/it.json

@@ -673,7 +673,98 @@
     "lineItemsTitle": "Righe",
     "billToSnapshotTitle": "Destinatario",
     "setupFeeCol": "Spese di attivazione",
-    "skillSetupFeeLabel": "Spese di attivazione"
+    "skillSetupFeeLabel": "Spese di attivazione",
+    "status_partially_refunded": "Rimborsata parzialmente",
+    "status_fully_refunded": "Rimborsata integralmente",
+    "voidBtn": "Annulla",
+    "voidReasonPlaceholder": "Motivo dell'annullamento (stampato sulla nota di credito)",
+    "voidReasonRequired": "Indicare un motivo per l'annullamento.",
+    "confirmVoid": "Conferma annullamento",
+    "voidedOnLabel": "Annullata",
+    "refundBtn": "Rimborsa",
+    "refundReasonPlaceholder": "Motivo del rimborso (stampato sulla nota di credito)",
+    "refundReasonRequired": "Indicare un motivo per il rimborso.",
+    "refundAmountInvalid": "L'importo del rimborso deve essere un numero positivo.",
+    "refundAmountExceeds": "L'importo supera il residuo rimborsabile di CHF {max}.",
+    "refundRemainingHint": "Residuo rimborsabile: CHF {max}",
+    "confirmRefund": "Conferma rimborso",
+    "refundedTotalLabel": "Rimborsato",
+    "refundedRemainingLabel": "Residuo rimborsabile",
+    "creditNotesPanelTitle": "Note di credito",
+    "creditNoteNumberHeader": "Numero",
+    "creditNoteKindHeader": "Tipo",
+    "creditNoteAmountHeader": "Importo",
+    "creditNoteReasonHeader": "Motivo",
+    "creditNoteIssuedHeader": "Emessa",
+    "creditNotePdfHeader": "PDF",
+    "creditNoteKind_void": "Annullamento",
+    "creditNoteKind_refund": "Rimborso",
+    "creditNoteNoPdf": "—",
+    "refundAmountLabel": "Importo",
+    "refundReasonLabel": "Motivo",
+    "refundAmountInclVatHint": "IVA inclusa",
+    "newInvoiceBtn": "Nuova fattura",
+    "draftsLink": "Bozze",
+    "backToDrafts": "Torna alle bozze",
+    "newInvoicePageTitle": "Nuova fattura",
+    "newInvoicePageSubtitle": "Scegli il cliente da fatturare. Aggiungerai le righe nel passaggio successivo.",
+    "newInvoiceOrgLabel": "Cliente",
+    "newInvoiceOrgPlaceholder": "— seleziona cliente —",
+    "newInvoiceOrgNoBilling": "nessun indirizzo di fatturazione",
+    "newInvoiceOrgBillingMissing": "Questo cliente non ha un indirizzo di fatturazione registrato. Chiedi al cliente di completare l'onboarding o imposta i dati dal pannello admin prima di emettere.",
+    "newInvoiceLocaleLabel": "Lingua del documento",
+    "newInvoiceOrgRequired": "Selezionare un cliente.",
+    "newInvoiceContinueBtn": "Continua",
+    "creating": "Creazione…",
+    "draftsPageTitle": "Bozze di fatture",
+    "draftsPageSubtitle": "Fatture personalizzate in corso. Riprendi la modifica o scarta.",
+    "draftsEmpty": "Ancora nessuna bozza. Inizia una nuova fattura.",
+    "draftOrgCol": "Cliente",
+    "draftIssueDateCol": "Data emissione",
+    "draftLinesCol": "Righe",
+    "draftSubtotalCol": "Subtotale (stima)",
+    "draftUpdatedCol": "Modificato",
+    "draftActionsCol": "Azioni",
+    "draftDeleteConfirm": "Scartare questa bozza? Operazione irreversibile.",
+    "editBtn": "Modifica",
+    "editorPageTitle": "Modifica bozza di fattura",
+    "editorBillToHeading": "Destinatario",
+    "editorNoBillingSnapshot": "Nessun indirizzo di fatturazione per questo cliente. L'emissione fallirà finché i dati di fatturazione non saranno impostati.",
+    "editorMetadataHeading": "Dettagli fattura",
+    "editorIssueDateLabel": "Data emissione",
+    "editorDueDateLabel": "Data scadenza",
+    "editorLocaleLabel": "Lingua del documento",
+    "editorPaymentMethodLabel": "Metodo di pagamento",
+    "editorPaymentInvoice": "Bonifico (fattura)",
+    "editorPaymentCard": "Carta di credito (Stripe)",
+    "editorLinesHeading": "Voci",
+    "editorLineDescription": "Descrizione",
+    "editorLineDescriptionPlaceholder": "es. Ore di consulenza, integrazione su misura, …",
+    "editorLineQty": "Q.tà",
+    "editorLineUnitPrice": "Prezzo unitario",
+    "editorLineAmount": "Importo",
+    "editorLineRemove": "Rimuovi riga",
+    "editorAddLine": "Aggiungi riga",
+    "editorAddDiscount": "Aggiungi sconto",
+    "editorAddDiscountHint": "Aggiunge una riga con prezzo unitario negativo. Modifica descrizione e importo se necessario.",
+    "editorRabattDefaultDescription": "Sconto",
+    "editorNotesHeading": "Note interne",
+    "editorNotesPlaceholder": "Note visibili solo all'admin (non sul PDF)",
+    "editorNotesHint": "Non mostrato al cliente.",
+    "editorTotalsHeading": "Totali (stima)",
+    "editorSubtotal": "Subtotale",
+    "editorVat": "IVA",
+    "editorTotal": "Totale",
+    "editorTotalsEstimateNote": "Stima basata sul paese del cliente. L'IVA finale è calcolata all'emissione.",
+    "editorSaveBtn": "Salva bozza",
+    "editorSavedBtn": "Salvato",
+    "editorPreviewBtn": "Anteprima PDF",
+    "editorIssueBtn": "Emetti fattura",
+    "editorDeleteBtn": "Scarta bozza",
+    "editorIssueConfirm": "Emettere questa fattura ora? Verrà assegnato un numero di fattura, il PDF sarà inviato al cliente e questa bozza verrà rimossa.",
+    "editorDeleteConfirm": "Scartare questa bozza? Operazione irreversibile.",
+    "previewing": "Apertura…",
+    "issuing": "Emissione…"
   },
   "skillCostDialog": {
     "title": "Conferma costi di attivazione",
@@ -746,14 +837,26 @@
       "paid": "Pagata",
       "overdue": "In ritardo",
       "void": "Annullata",
-      "uncollectible": "Inesigibile"
+      "uncollectible": "Inesigibile",
+      "partially_refunded": "Rimborsata parzialmente",
+      "fully_refunded": "Rimborsata integralmente"
     },
     "payWithCard": "Paga con carta",
     "redirectingToStripe": "Reindirizzamento…",
     "paymentReceived": "Pagamento ricevuto — grazie!",
     "paymentCancelled": "Pagamento annullato.",
     "configureBillingCta": "Configura dati di fatturazione",
-    "noBillingConfigNonOwner": "Solo il proprietario dell'organizzazione può configurare i dati di fatturazione. Contattalo per completare questo passaggio."
+    "noBillingConfigNonOwner": "Solo il proprietario dell'organizzazione può configurare i dati di fatturazione. Contattalo per completare questo passaggio.",
+    "creditNotesHeading": "Note di credito",
+    "creditNoteNumberCol": "Nota di credito",
+    "creditNoteInvoiceCol": "Fattura",
+    "creditNoteIssuedCol": "Emessa",
+    "creditNoteAmountCol": "Importo",
+    "creditNoteKindCol": "Tipo",
+    "creditNotePdfCol": "PDF",
+    "creditNoteKind_void": "Annullamento",
+    "creditNoteKind_refund": "Rimborso",
+    "creditNoteNoPdf": "PDF non disponibile"
   },
   "adminCron": {
     "title": "Automazione fatturazione",

src/types/index.ts

@@ -544,10 +544,57 @@ export type InvoiceStatus =
   | "paid"
   | "overdue"
   | "void"
-  | "uncollectible";
+  | "uncollectible"
+  // Phase 7: refund states. partially_refunded = at least one refund
+  // recorded but sum < total. fully_refunded = sum >= total. Voiding
+  // applies to unpaid invoices; refunding applies to paid invoices —
+  // the two states are mutually exclusive transitions from 'paid'
+  // versus 'open'.
+  | "partially_refunded"
+  | "fully_refunded";
 
 export type InvoicePaymentMethod = "invoice" | "card";
 
+// Phase 7 — credit notes are independent documents (separate
+// numbering, separate PDF) that record a void or refund against an
+// original invoice. Issued as part of voidInvoice() or
+// refundInvoice() flows; the customer downloads them from
+// /api/credit-notes/<number>/pdf.
+export type CreditNoteKind = "void" | "refund";
+
+export interface CreditNote {
+  id: string;
+  creditNoteNumber: string;
+  invoiceId: string;
+  invoiceNumber: string;
+  zitadelOrgId: string;
+  kind: CreditNoteKind;
+  amountChf: number;
+  vatAmountChf: number;
+  reason: string | null;
+  issuedAt: string;
+  issuedBy: string;
+  locale: string;
+  pdfFilename: string | null;
+  hasPdf: boolean;
+  billingSnapshot: InvoiceBillingSnapshot;
+}
+
+// Phase 7 — per-refund-event record (one row per Stripe Refund
+// object, or per admin-initiated refund for invoice-paid customers).
+// Aggregated into invoices.refunded_total_chf for query convenience.
+export interface InvoiceRefund {
+  id: string;
+  invoiceId: string;
+  stripeRefundId: string | null;
+  amountChf: number;
+  reason: string | null;
+  status: "pending" | "succeeded" | "failed" | "canceled";
+  refundedAt: string;
+  refundedBy: string;
+  creditNoteId: string | null;
+}
+
 // Phase 5 — Cron run history rows for the admin /admin/cron page.
 export type CronRunKind = "monthly_issue" | "reminders";
 export interface CronRun {
@@ -569,7 +616,11 @@ export type InvoiceLineKind =
   | "threema_messages"
   | "skill_usage"
   | "skill_setup"
-  | "adjustment";
+  | "adjustment"
+  // Phase 8 — line kind for ad-hoc invoices. Rendered under a
+  // "Services" / "Leistungen" header on the PDF. Negative
+  // unitPriceChf is allowed (used for Rabatt rows).
+  | "custom_line";
 
 /**
  * Snapshot of the customer's billing details captured at invoice
@@ -622,8 +673,19 @@ export interface Invoice {
   id: string;
   invoiceNumber: string;
   zitadelOrgId: string;
-  periodStart: string; // ISO date (YYYY-MM-DD)
-  periodEnd: string;
+  /**
+   * Phase 8: invoice provenance. 'auto' = generated by the monthly
+   * cron from tenant usage; 'custom' = created via the admin
+   * "New invoice" flow. Custom invoices have nullable period_start
+   * / period_end and skip the per-org-per-month uniqueness guard.
+   * Defaults to 'auto' for all pre-Phase-8 rows (backfilled by the
+   * column DEFAULT).
+   */
+  source: "auto" | "custom";
+  // Billing period — null on custom invoices that aren't tied to a
+  // billing period.
+  periodStart: string | null;
+  periodEnd: string | null;
   issuedAt: string;
   dueAt: string;
   subtotalChf: number;
@@ -641,6 +703,16 @@ export interface Invoice {
   paidAt: string | null;
   paidBy: string | null;
   paidMethodDetail: string | null;
+  // Phase 7 — void tracking. Populated when status='void'. The reason
+  // free-text is rendered on the credit note PDF.
+  voidReason: string | null;
+  voidedAt: string | null;
+  voidedBy: string | null;
+  // Phase 7 — running sum of refunds applied to this invoice. Zero
+  // for invoices that have never been refunded. Drives status
+  // transitions (partially_refunded vs fully_refunded) and the
+  // running-total widget on /billing.
+  refundedTotalChf: number;
   createdAt: string;
 }
 
@@ -658,8 +730,21 @@ export interface InvoiceDetail {
  */
 export interface InvoiceDraft {
   zitadelOrgId: string;
-  periodStart: string;
-  periodEnd: string;
+  /**
+   * Phase 8: optional for custom invoices. The auto cron always
+   * sets both period_start and period_end; the custom flow may
+   * leave them null.
+   */
+  periodStart: string | null;
+  periodEnd: string | null;
+  /**
+   * Phase 8: optional override of the issue date. When omitted,
+   * the DB uses now() at insertion time. The custom flow uses
+   * this to let admin backdate or future-date invoices.
+   */
+  issuedAt?: string;
+  /** Phase 8: 'auto' (cron) or 'custom' (admin form). Defaults to 'auto'. */
+  source?: "auto" | "custom";
   dueAt: string;
   locale: string;
   paymentMethod: InvoicePaymentMethod;
@@ -677,6 +762,65 @@ export interface InvoiceDraft {
   warnings: string[];
 }
 
+// ---------------------------------------------------------------------------
+// Phase 8 — custom invoice drafts
+// ---------------------------------------------------------------------------
+
+/**
+ * The shape persisted in the invoice_drafts.payload JSONB column.
+ * This is the in-progress form state the admin is composing — not
+ * yet an invoice. On "Issue" it's converted into a real Invoice row
+ * via billing.issueCustomInvoiceDraft and the draft row deleted.
+ *
+ * Kept separate from InvoiceDraft (which is the compute pipeline's
+ * type for in-flight monthly bills) so the two domains don't
+ * accidentally drift.
+ */
+export interface CustomInvoiceDraftPayload {
+  /** ISO date (YYYY-MM-DD). Defaults to today on creation. */
+  issueDate: string;
+  /** ISO date (YYYY-MM-DD). Defaults to issueDate + 30 days. */
+  dueDate: string;
+  /** Locale for the PDF and email; defaults to org's default. */
+  locale: "de" | "en" | "fr" | "it";
+  paymentMethod: InvoicePaymentMethod;
+  /**
+   * Optional notes only the admin sees in the portal (not on the PDF).
+   */
+  adminNotes?: string;
+  lines: CustomInvoiceDraftLine[];
+}
+
+export interface CustomInvoiceDraftLine {
+  /** Free-text description, shown on the PDF as the line label. */
+  description: string;
+  /**
+   * Decimal quantity. Most cases are integer (1, 2, 10 hours) but
+   * we allow decimal for fractional hours (0.5) or ratios.
+   */
+  quantity: number;
+  /**
+   * CHF per unit. Negative values are allowed for discount /
+   * Rabatt rows — the PDF shows them as negative amounts and the
+   * subtotal is the algebraic sum of all line amounts.
+   */
+  unitPriceChf: number;
+}
+
+/**
+ * The DB row in invoice_drafts. The admin can save a draft, come
+ * back later, and issue it (or delete it) at any time. Drafts have
+ * no invoice number, no PDF, and are never visible to the customer.
+ */
+export interface InvoiceDraftRecord {
+  id: string;
+  zitadelOrgId: string;
+  createdBy: string;
+  createdAt: string;
+  updatedAt: string;
+  payload: CustomInvoiceDraftPayload;
+}
+
 // ---------------------------------------------------------------------------
 // Skill activation requests — manual provisioning queue
 // ---------------------------------------------------------------------------