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Access to and use of this system, and the information contained herein, is restricted to TD Ameritrade authorized users, solely for the purpose of conducting TD Ameritrade business, and is governed by TD Ameritrade policies. Unauthorized access is prohibited. Access to and use of this system is monitored for security purposes. TD Ameritrade for developer | home TD Ameritrade Developer. for developers. Updated Guides. Jul 18. Phase 1: Authentication Update for the XML based API. This guide will help you get started with the new authentication process into the XML based API. This will not affect clients that are already on the new JSON API through this Developer Portal. The only change for Phase 1