Hey @ron.jailall,
This is just an additional page that you can provide to your users to help them get setup.
Yes, you are correct, Zoom provides the user_id and signature as a query param once you land on the configuration page.
?user_id=XX&signature=XX
You can take the user_id from the query param, and call the GET User endpoint, which will return the accound_id.
Let me know if that answers your question! 
Thanks,
Tommy