PowerBI rest API

Hi Team,

I am using PowerBI Rest API to fetch data however i am getting error 401.

I tried few solution which are aviable in the forum but not getting succes,

i have few doubt in the  Authorize User

1. Scope
2. State
3. ResponseMode
4. ClientID- this i know.
5. ResponseType
6. RedirectURI.

Link-  https://login.microsoftonline.com/common/oauth2/authorize

what to write in the above point and where do i get these?

can someone help me out in this?