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The Aqueduct API supports idempotency to ensure it is safe to retry requests without accidentally performing the same operation twice. This means that it’s always safe to retry a request if you’re unsure that it went through - as long as you supply the same idempotency key. There are two ways to perform idempotent requests: On an API request To perform an idempotent request, provide an Idempotency-Key: <key> HTTP header to any POST request. Aqueduct will save the resulting response code and body of the fully executed request made for an idempotency key. Any subsequent requests with the same idempotency key do not execute and instead return the same result. GET and DELETE requests do not need an idempotency key as they are always idempotent. Idempotency keys can be any unique string. We suggest that you use a UUID library in your programming language of choice. Note that we occasionally prune our idempotency key cache, but we guarantee that each idempotency key will live for at least 24 hours. On billable events We support idempotency on each BillableEvent resource. This is useful in case you decide to send multiple BillableEvents in a single request. You can supply an idempotencyKey for each BillableEvent, and Aqueduct will ensure that BillableEvents are not double-counted.