While the full release of the Facebook Credits system (nor the release of the full API to developers) has yet to be announced, there have been a handful of games that have been testing the Facebook Credits integration. As we reported back in mid-December, Happy Island, developed by CrowdStar, was the first game that exclusively used Facebook Credits for all in-game purchases. Recently, we’ve noticed that a “Payments Issues” link has been added to the footer of Happy Island, which provides a sneak peek at what options users will have to dispute payments.

See the a break down of the user flow and more questions regarding what this means for developers at InsideSocialGames.com.