I am wondering, is there any way to make a whitelist of email log-ins?
Here’s my use-case:
I have about 300 people who I want to use the app, to sign up with a specific email.
Is there any way that I can whitelist log-ins so ONLY people with matching emails can sign up for the app?
A variety of options are possible. My approach would be to use firebase authentication. First, in firebase create a list of emails you want to be able to use your app. In the app, allow anyone to sign up and sign in.
In the sign in block, if they successfully authenticate, check the firebase white list. If the sign in email is not in the list, sign them out of firebase and redirect the app to a screen explaining the app is private.