问题
How one can forbid new users to sign in using Firebase Email Link? So only exiting customers can sign in.
I want to register only users that will subscribe via Stripe and create new account server-side.
Also, if I may do it in the same thread: how can I edit email template that is sent to the new user? In console this one is not available.
来源：https://stackoverflow.com/questions/61779992/firebase-email-link-only-for-existing-users-forbid-new-users