When I try to get the access token I get the following error:

"errorCode" : "OAU-270",
    "message" : "None of the required parameters [brand_id],[account_id], [partner_account_id] were found in the request"

I can’t find any documentation, on how to include those values in the request:

I am using the following URL:

https://platform.ringcentral.com/restapi/oauth/token

Any help would be appreciated

Thanks