This article pretty much explains it. http://techcrunch.com/2013/04/10/well-that-was-fast-twitter-shut-down-ribbons-newly-launched-in-stream-payments-feature-b

This article pretty much explains it. http://techcrunch.com/2013/04/10/well-that-was-fast-twitter-shut-down-ribbons-newly-launched-in-stream-payments-feature-built-using-twitter-card-technology/ http://techcrunch.com/2013/04/10/well-that-was-fast-twitter-... More specifically, it uses the Twitter "Player" card to load an iFrame with a separately hosted Ribbon checkout page. Example here: https://www.ribbon.co/086f0a?twitter=true https://www.ribbon.co/086f0a?twitter=true