Idempotent key
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An idempotent key is a field in a request that uniquely identifies that request's intent.
If a retry is needed on a request, then the same idempotent key is sent. If both requests make it to the server, then the server can throw out the duplicate request by keeping track of the keys it has already seen.
This is commonly seen on REST API calls where you don't want a call executed twice such as banking APIs.
References[edit]
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