hard20 pts · first answer countsdatabasesredisidempotency

Two payment retries run at once

A payment API checks Redis for the idempotency key with GET, and if it is missing, processes the payment and then SETs the key. Two retries arriving together both charge the card. What is the fix?

A.Claim the key first with SET key pending NX EX 86400B.Add a 50 ms sleep before the GETC.Use GET twice to confirm the key is missingD.Store the key in the browser instead

Discussion 0

Join free to post in the discussion.

Two payment retries run at once

Discussion 0

Related questions