I want to develop an app mobile (in Flutter) with a cloud backend (I have not another server). With Firebase, it supports only 4 providers (Fb, Twitter, Google, Github).
I need to connect Strava oAuth and use this login in my backend service. So, back4app is perhaps the solution. Here, listing of providers supported by back4app https://docs.parseplatform.org/parse-server/guide/#oauth-and-3rd-party-authentication, but no Strava...
Another section here to use non supported provider : https://docs.parseplatform.org/parse-server/guide/#custom-authentication but how can I do ? I don't understand this section.
Thxs