hard20 pts · first answer countsoffline-syncapi-design

Duplicate orders from offline retries

An offline queue retries a "place order" POST after a timeout. The server had actually processed the first attempt, so the customer gets two orders. What is the right fix?

A.Retry less often, waiting at least ten minutes between attempts, so the server has time to finish and its own duplicate check can catch upB.Create an idempotency key on the device, keep it with the queued request and send it on every retry, so the server returns the first resultC.Send the order as a GET requestD.Delete the request from the queue after the first attempt, whatever the outcome

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Duplicate orders from offline retries

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