An idempotent operation is one that has no additional effect if it is called more than once with the same input parameters. All Core APIDocumentation Index
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POST calls are idempotent capable when the primary token is set in the request object.
For example, if you send a POST request to create a resource and don’t receive a response because the card network timed out, you can reissue the same call, with identical content and primary token, and will receive a 201 success response.