I'm using Firebase in a side project that requires authentication using Facebook, Twitter, Google and Twitch. Unfortunately, Firebase Auth doesn't support authentication using Twitch out of the box. I would like to know the best approach to solve the problem: can I use Firebase Auth & a Custom Auth system only for Twitch?
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Firebase supports signing in with any provider, as long as you are willing to write the code for it. The process is pretty well documented in a page called creating custom tokens.
If you're looking for samples for other providers, have a look at the functions-samples
repo, which contains a.o. samples for signing in with LinkedIn, Okta, and Spotify.

Frank van Puffelen
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