Autorised Twitter application only once

Autorised Twitter application only once

I am developing one application. where I need to provide the feature to
post a message on twitter after login. users need to authorize using their
twitter account only once. some authentication code / token will be store
in DB for future action
To do this which API do I need to be used ??
I have used https://dev.twitter.com/docs/api/1/get/oauth/authorize
(https://api.twitter.com/oauth/authorize) API to authorize the user for
the first time. it will return oauth_token and oauth_verifier
How can I use these two parameters to post the message on Twitter for any
authorized user (authorized previously) ??
Please let me know