Although we received credentials for the Sandbox, but just for testing purpose we still do not have the test data. Always VISA team say that the test data needs to be matched with the Issuer host database.
But for testing the VTS API, we just need some test data which can help us to test in the sandbox.
It's great to hear of your interest in Visa Token Services APIs. I'm happy to help you with your questions. Visa Token Service is a restricted product. Do you have access to the restricted VTS API product?
I'll check to see what we can do for you and get back to you on this.
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