diff --git a/src/pages/billing/SubscriptionTab.tsx b/src/pages/billing/SubscriptionTab.tsx
index 413f798..29ad357 100644
--- a/src/pages/billing/SubscriptionTab.tsx
+++ b/src/pages/billing/SubscriptionTab.tsx
@@ -350,14 +350,21 @@ export const SubscriptionTab: React.FC<SubscriptionTabProps> = ({ mandateId }) =
 
       if (sessionId && !verifyCalledRef.current) {
         verifyCalledRef.current = true;
-        verifyCheckout(sessionId)
-          .then((result) => {
+        const _pollUntilActive = async (retries = 5, delayMs = 2000) => {
+          try {
+            const result = await verifyCheckout(sessionId);
             if (result.status === 'activated') {
               setCheckoutMessage({ type: 'success', text: 'Abonnement wurde aktiviert.' });
               setJustPaid(false);
+              return;
             }
-          })
-          .catch(() => {});
+          } catch { /* handled below via retry */ }
+          if (retries > 0) {
+            await new Promise(r => setTimeout(r, delayMs));
+            await _pollUntilActive(retries - 1, delayMs);
+          }
+        };
+        _pollUntilActive();
       }
     } else if (params.get('canceled') === 'true') {
       setCheckoutMessage({ type: 'info', text: 'Checkout abgebrochen. Ihr bestehendes Abonnement bleibt aktiv.' });