I am making a simple twitter based login/signup system using the tutorial here. I get the oauth_token as well as oauth token secret every time I get the user to login. Howe
The normal flow dictates that applications send request tokens to oauth/authorize in Twitter's implementation of the OAuth Specification. To take advantage of "Sign in with Twitter", applications should send request tokens received in the oauth_token parameter to oauth/authenticate instead.
(c) https://dev.twitter.com/docs/auth/sign-in-with-twitter
So find where their library (or your code) performs request to /authorize
endpoint and replace it with /authenticate
About tokens: as long as you've received user tokens - store it in some persistent storage (database, file, etc) since that tokens are permanent (they will be valid until user haven't revoked them manually).
Enable option "Sign in with Twitter" for application OAuth Settings