Yes, OAuth and OpenID Connect are both standardized protocols, so they are effectively abstractions for performing delegated authorization and authentication, r

Yes, OAuth and OpenID Connect are both standardized protocols, so they are effectively abstractions for performing delegated authorization and authentication, respectively. They exist basically to promote best practices and to help promote interoperability between products - mores with OpenID Connect, as OAuth does not really have any profiles of usage attached to it. You sound like you may be looking for a CIAM solution. Searching for CIAM (a customer identity and access management product) should show you tons of alternatives. Full disclosure is that my employer sells one of these, PingOne for Customers. To clarify the parent's post, Firebase Auth also has the related Google Cloud Identity Platform - I will say even as someone in this space I don't fully understand the reasoning behind Google selling both of those products, however.