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The Bango Subscriptions API supports idempotency. With idempotency, the API guarantees to return the same response given a duplicate request. This helps avoid accidental duplications, especially when creating a subscription. For example, if you make an API request to create a subscription, and then make the same API request again, the response to the second request will be identical to the response to the first request. The second request does not create a new subscription. To use idempotency, include the header X-RequestIdentifier in every API request. The header must have a globally unique value. This lets the Bango Subscriptions API identify repeated requests.