payment-idempotency

To prevent duplicate charges during payment gateway retries, enforce idempotency by using a unique paymentId as the idempotency key for Create Payment requests, returning the exact stored response if duplicates are detected.

Idempotency in payment processing is a mechanism ensuring consistent results when identical payment requests are retried, preventing duplicate charges by checking for existing payment identifiers and returning stored responses.

Implement safe retry strategies for async and sync payment methods by persisting payment state in a durable data store, ensuring valid state transitions and consistent responses across retry attempts.

Guard against duplicate Cancel, Capture, and Refund operations by applying requestId-based guards that check existing payment state before processing, ensuring duplicate operations return consistent results without re-executing.

Yes, a durable data store is required to enforce idempotent payments, as it maintains persistent payment state necessary to identify duplicate requests and return identical stored responses during gateway retries.

The best way to handle gateway retries for undefined payments is to enforce idempotency guards that check for existing paymentId values, persist state durably, and return consistent results for repeated requests.