fix stripe configuration

web/src/server/services/billing.service.ts

@@ -40,21 +40,20 @@ export async function createCheckoutSession(
   userId: string,
   email: string,
   priceId: string,
-  successUrl: string,
-  cancelUrl: string,
+  returnUrl: string,
 ) {
   const customerId = await getOrCreateCustomer(userId, email);
 
   const session = await stripe.checkout.sessions.create({
     customer: customerId,
     mode: "subscription",
+    ui_mode: "embedded_page",
     line_items: [{ price: priceId, quantity: 1 }],
-    success_url: successUrl,
-    cancel_url: cancelUrl,
+    return_url: `${returnUrl}?session_id={CHECKOUT_SESSION_ID}`,
     metadata: { userId },
   });
 
-  return { url: session.url, sessionId: session.id };
+  return { clientSecret: session.client_secret ?? "", sessionId: session.id };
 }
 
 export async function createPortalSession(customerId: string, returnUrl: string) {