Hello,
We are using the endpoint (https://platform.devtest.ringcentral.com/restapi/oauth/token?username=19294732631&password=****&extension=101&grant_type=password) to get the access token in the response.
In header I am passing some information and in the value of Authorization is passed in (Basic + base64_encoded(Client ID : Client Secret) format.
I am getting the error invalid_client.
Can you suggest us, how to get the access token in response for authorization.