Design the idempotency mechanism for a money transfer API. Should you use idempotency keys, and if so, how long do you store them? What happens if a client reuses a key with different parameters?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Design the idempotency mechanism for a money transfer API. Should you use idempotency keys, and if so, how long do you store them? What happens if a client reuses a key with different parameters?

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