diff --git a/backend/src/features/subscriptions/external/stripe/stripe.client.ts b/backend/src/features/subscriptions/external/stripe/stripe.client.ts
index cf1050f..1105f1b 100644
--- a/backend/src/features/subscriptions/external/stripe/stripe.client.ts
+++ b/backend/src/features/subscriptions/external/stripe/stripe.client.ts
@@ -75,6 +75,14 @@ export class StripeClient {
     try {
       logger.info('Creating Stripe subscription', { customerId, priceId, paymentMethodId });
 
+      // Attach payment method to customer before creating subscription
+      if (paymentMethodId) {
+        await this.stripe.paymentMethods.attach(paymentMethodId, {
+          customer: customerId,
+        });
+        logger.info('Payment method attached to customer', { customerId, paymentMethodId });
+      }
+
       const subscriptionParams: Stripe.SubscriptionCreateParams = {
         customer: customerId,
         items: [{ price: priceId }],