[Job Launcher] Default card (#3345)

* feat: enhance default payment method handling in confirmCard

* feat: improve readability of confirmCard method

Author: flopez7

packages/apps/job-launcher/server/src/modules/payment/payment.service.ts

@@ -131,19 +131,27 @@ export class PaymentService {
       this.logger.log(ErrorPayment.SetupNotFound, PaymentService.name);
       throw new NotFoundError(ErrorPayment.SetupNotFound);
     }
-    if (data.defaultCard || !user.stripeCustomerId) {
+
+    let defaultPaymentMethod: string | null = null;
+    if (!user.stripeCustomerId) {
+      // Assign the Stripe customer ID to the user if it does not exist yet.
+      user.stripeCustomerId = setup.customer as string;
+      await this.userRepository.updateOne(user);
+    } else {
+      // Check if the user already has a default payment method.
+      defaultPaymentMethod = await this.getDefaultPaymentMethod(
+        user.stripeCustomerId,
+      );
+    }
+
+    if (data.defaultCard || !defaultPaymentMethod) {
       // Update Stripe customer settings to use this payment method by default.
-      await this.stripe.customers.update(<string>setup.customer, {
+      await this.stripe.customers.update(user.stripeCustomerId, {
         invoice_settings: {
           default_payment_method: <string>setup.payment_method,
         },
       });
     }
-    if (!user.stripeCustomerId) {
-      // Assign the Stripe customer ID to the user if it does not exist yet.
-      user.stripeCustomerId = setup.customer as string;
-      await this.userRepository.updateOne(user);
-    }
 
     return true;
   }