Is it possible to do verification for Sandbox APIs (Account and Payment initiative) - though it gives the same response?

The current version of the Sandbox APIs returns the same data response for a request, independent of the parameters which are sent in the request. We are providing you with different test cases to access different test user’s data. For more information on how to do your testing in Sandbox environment please log in to developer portal, select Sandbox API you’re interested in and follow instruction provided in “Documentation” tab on API store page.