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Dev.to
7/6/2026
The original title is about the difference between retry and idempotency in payment systems. Let me rewrite this as a punchy headline.

The original title is about the difference between retry and idempotency in payment systems. Let me rewrite this as a punchy headline.

Original: The Difference Between Retry and Idempotency They're Not the Same

Short summary

Retry logic (client resilience) and idempotency (server correctness) are independent properties often confused but both essential for payment system correctness. Retry without server idempotency causes duplicate operations; both working together requires the same idempotency key on every retry, distributed locks, and durable storage. Transactional outbox pattern eliminates race conditions between payment execution and idempotency-key storage.

  • •Retry (client resilience) and idempotency (server correctness) are separate concerns often incorrectly treated as synonymous
  • •Client must send identical idempotency key on every retry; server must use distributed locks and durable storage
  • •Missing either component causes duplicate operations under load; transactional outbox pattern eliminates failure modes

Generated with AI, which can make mistakes.

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