ReadyAPI Authentication

Dear Friends,
I wanted to configure the authentication for my services using OAuth 2.0(Azure profile). While configuring there is a section of Redirect URL. what is Redirect URL? How can we configure the Redirect URL?
I tried with the value http://localhost:8080 as I read in the documentation but it did not work.
Can anyone explain here also what URL should we provide to get the access token ?

Regards

Asad