hard20 pts · first answer countsapi-testingidempotency

Reusing an idempotency key

A payments API supports an Idempotency-Key header. You send POST /payments with key abc-123 and amount 100, which succeeds. You then send the same key with amount 500. What is the correct behaviour?

A.Charge 500 as a new paymentB.Charge 400 more so the total is 500C.Reject the second request with an error (for example 409 or 422) because the key was already used with a different body, and create no new chargeD.Return 500 Internal Server Error

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Reusing an idempotency key

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