hard20 pts · first answer countsreliabilityidempotencyretries

Idempotency keys that expire too soon

A payment API stores idempotency keys for 24 hours. A mobile app queues a failed payment offline and retries it with the same key 3 days later. What happens?

A.The key is gone, so the payment may be charged twiceB.The API recognises the key and returns the old resultC.The retry is rejected because keys are single-useD.The payment is merged with the original automatically

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Idempotency keys that expire too soon

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