How do I get someone's auth token by giving them a link and making them log in?

How do I get someone's auth token by giving them a link and making them log in?

Basic landing page that takes in their username + password, then forward them through axios or curl to the Twitter api.

If it requires 2fa, just prompt them a 2nd box to enter their 2fa key and foward that to Twitter.

Essentially your just taking the users input on your own webpage and forwarding it to Twitter's api/website.