How To Data drive using Internal Data to serve Rest API requests

Hi Gurus,

I want to use Internal Data to serve multiple Rest API requests,for example service A has 2 functions Login and password ,suppose i serve that requirement using Internal Data and verify 200 OK received ,Now second time request should pick the pick the 2nd Tabular record in Internal Data i.e. Login ID ,password and verify the 200 OK received.Similarly 3rd time request should pick the 3rd Tabular record in Internal Data i.e. Login ID ,password and verify the 200 OK received.

How can i do that?

Regards,
Tarun