Forbidden 403 error for datasets/group through REST API (postman)

Hi Team,

I am creating oAuth token with below request payload and getting oAuth bearer token. When i use that token to list data sets, groups, add rows to dataset tables, we are getting the 403 Forbidden access. 

POST https://login.windows.net/common/oauth2/token

grant_type : client_credentials

resource: https://analysis.windows.net/powerbi/api

client_secret: XXXX

client_id: XXXX

This issue is blocking us to update data set tables data, do we have any documentation to get oAuth beare token from REST API (postman)

Thanks

Mani