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Authenticate users created in Bubble on mobile app (flutter and firebase)

Hey, I’m having trouble understanding how to exactly set up and use Bubble API to simply authenticate a user in a mobile app created with Flutter and Firebase.

Case is simple:

When a user inputs his email and password at the app starting screen - check with Bubble API if the user exists and if password and email match.

Then, when the app is running - check the user additional variable subscription.active = true/false

I couldn’t find anywhere even in docs - how to set it up.