The Request Timed Out, But the Payment Succeeded: Building Retry-Safe Mobile APIs

Mobile networks are notoriously unreliable. A common scenario is when a user taps "Pay Now" in an app: the payment request reaches the server and is processed, but the network response never reaches the phone. The client assumes the request failed and retries, leading to the charge running twice. This is precisely the kind of bug that idempotency... Weiterlesen