Is there anything going on with the sandbox? I am able to retreive the existing customer profile, when I attempt to add a payment profile to it I get a 500 error when I execute the controller, IE (vb code);
Dim controller = New createCustomerPaymentProfileController(request)
Catch ex As Exception
pErrorMsg = ex.Message ' "The remote server returned an error: (500) Internal Server Error."
I am connecting using TLS v1.2, so that shouldn't be an issue.