Can I use the Users service on the ionic.io platform as an OAuth provider with CouchDB for authentication? I have a design using local PouchDb and replication w/ a CouchDB backend. I would like to do authentication w/ the Ionic Users service on the ionic.io platform and have this work w/ a per-user database model on CouchDB. But don’t see how to integrate the ionic service as a provider for OAuth. I see lots of info w/ data flowing the other way where Ionic is a client for the social identity providers like FB, Twitter, Google, etc.