How can I send a unique id or email and password to the user's e-mail?

Question

I have an application and on a page in this application there is another page that I need to redirect via an id or email and password sent to the user's e-mail. I need to send this random information to the e-mail the user used while registering, and the user should not log in to this page with any other email or password other than this information. I am using Firebase as database.

Answer 1

What you're describing is pretty much exactly what Firebase Authentication's email link provider does, so I recommend checking that out.