in-app purchases on Android, Google wants to give you an outlet for your app spending online as well. The search giant is hard at work turning last year's acquisition of Jambool and its Social Gold software into a web-based in-app payments platform it can call its own. Jambool's proprietors have word that Google's system is now in beta, which has led it to close new signups for the Social Gold offering, ahead of halting payment processing entirely on May 31st. That should serve as a pretty reliable guide for when to expect Google to flip the switch on its in-app purchasing service, which we're hearing will include some level of integration with Google Checkout and Google accounts. As TechCrunch points out, the next Google I/O gathering is scheduled for May 10th -- sounds about the right time for us to be introduced to this new, app-based way for separating us from our hard-earned cash.