How do I choose to allow who I want to allow sign into my app, by making restrictions on firebase… That is, how can I do it in such a way that i will choose who should sign in based on their numbers, email e.t.c… I want people to pay fornmy app in cash directly to me, then when they sign in, I will then send them a password to their numbers, so as to login
This blog page from the Firebase devs, may give you an insight to how you can control user access to your Firebase
However, why dont visit this page once to develop your idea…?