Requesting Approval from Twitter
To participate in the Twitter Cards program, follow Twitter's online instructions. Make sure to include the link to the web page you created in the previous procedure.
Prepare your Twitter Card markup using the instructions at https://dev.twitter.com/cards/overview.
Once your Twitter Cards markup is ready, use Twitter's validator at https://dev.twitter.com/docs/cards/validation/validator to request approval for your domain name.
After you are approved, you are ready to add your web page to production.