Looks like there are two ways to get Amendments via the REST API (with the amendment id, that is. You can also get them by subscription, according to the docs). The one that gets you the CreatedDate is the "CRUD" prefixed one, found here: https://www.zuora.com/developer/api-reference/#operation/Object_GETAmendment Since it's a GET, it's just a different endpoint This guy gets you the CreatedDate "https://rest.zuora.com/v1/object/amendment/{id}" Whereas this one does not "https://rest.zuora.com/v1/amendments/{amendment-key}" I don't know the "why" of this. Someone else here may be able to help if you're interested in that part.
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