Saved cards

Use this demo to test a saved-card payment before copying the integration pattern into your app:

1. Provide a secure_token minted by your backend for saved-card operations.
2. Fetch the customer’s saved cards with getCustomerCards().
3. Select a saved card. If the card has no subscription_id, the demo mounts the saved-card CVV field.
4. Click Deposit to call pay() with payment_method.type = 'saved_card' and the optional idempotency_key.
5. Reconcile the final status with your backend/webhooks before fulfillment.