The following page describes oauth using client credentials :

https://ringcentral-api-docs.readthedocs.io/en/stable/authentication/client-creds/

I'd like to know if this auth flow is still available and if so, can I get it added to my dev apps ?

Seems this would be the way to do auth without a user having to login. Use case for this would include pulling call logs and setting up subscription webhooks. Neither of these 2 examples should require user login.