Phase4: Stripe

src/components/billing/payment-status-banner.tsx

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+"use client";
+
+import { useEffect, useState } from "react";
+import { useRouter } from "next/navigation";
+import { useTranslations } from "next-intl";
+
+/**
+ * Banner shown after a return from Stripe Checkout.
+ *
+ *   ?paid=1       → green success banner. The webhook may or may
+ *                   not have processed yet, so we phrase the message
+ *                   as "Payment received, status will update shortly"
+ *                   and don't claim the status is already paid. A
+ *                   light auto-refresh after a few seconds nudges
+ *                   the page to pick up the new status badge.
+ *
+ *   ?cancelled=1  → neutral grey banner: "Payment cancelled". The
+ *                   invoice stays in 'open' state.
+ *
+ * The banner cleans up the query params from the URL so a page
+ * reload doesn't repeat the message. We use router.replace() to
+ * keep history clean.
+ */
+export function PaymentStatusBanner() {
+  const router = useRouter();
+  const t = useTranslations("customerBilling");
+  const [state, setState] = useState<"paid" | "cancelled" | null>(null);
+
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    if (params.has("paid")) {
+      setState("paid");
+      // Reload after 4s so the status badge picks up the webhook's
+      // effect on the invoice row. By then most webhook deliveries
+      // have landed; if not the user just sees "open" and can
+      // manually refresh.
+      const timer = setTimeout(() => {
+        router.refresh();
+      }, 4000);
+      // Strip the query string out of the URL.
+      const cleanUrl = window.location.pathname;
+      window.history.replaceState({}, "", cleanUrl);
+      return () => clearTimeout(timer);
+    } else if (params.has("cancelled")) {
+      setState("cancelled");
+      const cleanUrl = window.location.pathname;
+      window.history.replaceState({}, "", cleanUrl);
+    }
+  }, [router]);
+
+  if (state === "paid") {
+    return (
+      <div className="mb-4 p-3 rounded-md border border-success bg-success/10 text-sm text-success">
+        {t("paymentReceived")}
+      </div>
+    );
+  }
+  if (state === "cancelled") {
+    return (
+      <div className="mb-4 p-3 rounded-md border border-border bg-surface-2 text-sm text-text-secondary">
+        {t("paymentCancelled")}
+      </div>
+    );
+  }
+  return null;
+}