Mis kasutati idempotentsusvõtmena?

As an idempotency key, a unique request or transaction identifier, such as UUID, is often used, generated on the client or server side during the first call of the operation.

This allows, in case of repeated requests with the same key, not to perform the action again, but to return the result of the previous execution.

Example: when purchasing an in-game item, the client sends a request with a unique transactionId. If the request is repeated due to network issues, the server checks this key and does not charge money twice.