fix: page /checkout/success qui auto-sync le plan apres paiement Stripe (success_url corrige)

frontend/src/app/checkout/success/page.tsx

@@ -0,0 +1,90 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import { useSearchParams, useRouter } from 'next/navigation';
+import { API_BASE } from '@/lib/config';
+import { CheckCircle2, XCircle, RefreshCw } from 'lucide-react';
+
+/**
+ * /checkout/success
+ * Stripe redirects here after a successful payment.
+ * We call /api/v1/auth/checkout/sync to update the user plan in DB,
+ * then redirect to /dashboard/profile?tab=subscription.
+ */
+export default function CheckoutSuccessPage() {
+  const searchParams = useSearchParams();
+  const router = useRouter();
+  const sessionId = searchParams.get('session_id');
+
+  const [status, setStatus] = useState<'syncing' | 'ok' | 'error'>('syncing');
+  const [message, setMessage] = useState('');
+
+  useEffect(() => {
+    if (!sessionId) {
+      // No session_id — just redirect to profile
+      router.replace('/dashboard/profile?tab=subscription');
+      return;
+    }
+
+    const token = localStorage.getItem('token');
+    if (!token) {
+      router.replace('/auth/login');
+      return;
+    }
+
+    // Sync the checkout session to update plan in DB
+    fetch(`${API_BASE}/api/v1/auth/checkout/sync?session_id=${sessionId}`, {
+      headers: { Authorization: `Bearer ${token}` },
+    })
+      .then(async (res) => {
+        let data: any = {};
+        try { data = await res.json(); } catch { /* ignore */ }
+        if (res.ok) {
+          setStatus('ok');
+          setMessage(data.data?.plan ? `Forfait ${data.data.plan} activé !` : 'Abonnement activé !');
+          // Redirect after 2s
+          setTimeout(() => router.replace('/dashboard/profile?tab=subscription'), 2000);
+        } else {
+          setStatus('error');
+          setMessage(data.message ?? data.error ?? 'Erreur de synchronisation');
+          setTimeout(() => router.replace('/dashboard/profile?tab=subscription'), 3000);
+        }
+      })
+      .catch(() => {
+        setStatus('error');
+        setMessage('Erreur réseau. Votre paiement est confirmé — rechargez votre profil.');
+        setTimeout(() => router.replace('/dashboard/profile?tab=subscription'), 3000);
+      });
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [sessionId]);
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-background">
+      <div className="flex flex-col items-center gap-6 p-12 rounded-3xl bg-white dark:bg-[#141414] shadow-2xl max-w-md w-full mx-4 text-center">
+        {status === 'syncing' && (
+          <>
+            <RefreshCw className="w-12 h-12 text-brand-accent animate-spin" />
+            <h1 className="text-2xl font-black uppercase tracking-tight">Activation en cours…</h1>
+            <p className="text-sm text-muted-foreground">Nous mettons à jour votre abonnement, veuillez patienter.</p>
+          </>
+        )}
+        {status === 'ok' && (
+          <>
+            <CheckCircle2 className="w-12 h-12 text-emerald-500" />
+            <h1 className="text-2xl font-black uppercase tracking-tight text-emerald-600">Paiement confirmé !</h1>
+            <p className="text-sm text-muted-foreground">{message}</p>
+            <p className="text-xs text-muted-foreground">Redirection vers votre profil…</p>
+          </>
+        )}
+        {status === 'error' && (
+          <>
+            <XCircle className="w-12 h-12 text-amber-500" />
+            <h1 className="text-2xl font-black uppercase tracking-tight">Paiement reçu</h1>
+            <p className="text-sm text-muted-foreground">{message}</p>
+            <p className="text-xs text-muted-foreground">Redirection…</p>
+          </>
+        )}
+      </div>
+    </div>
+  );
+}

services/payment_service.py

@@ -117,7 +117,7 @@ async def create_checkout_session(
             mode="subscription",
             payment_method_types=["card"],
             line_items=[line_item],
-            success_url=success_url or f"{os.getenv('FRONTEND_URL', 'http://localhost:3000')}/dashboard?session_id={{CHECKOUT_SESSION_ID}}",
+            success_url=success_url or f"{os.getenv('FRONTEND_URL', 'http://localhost:3000')}/checkout/success?session_id={{CHECKOUT_SESSION_ID}}",
             cancel_url=cancel_url or f"{os.getenv('FRONTEND_URL', 'http://localhost:3000')}/pricing",
             metadata={"user_id": user_id, "plan": plan.value},
             subscription_data={