Google said they were coming this week, and here they are -- Android apps can now have their own miniature storefronts for in-app purchases galore. You'll find Tap Tap Revenge, Comics, Gun Bros, Deer Hunter Challenge HD, WSOP3 and Dungeon Defenders: FW Deluxe accept your credit card for microtransactions starting this very instant, and Android developers can start building similar functionality into their own creations right now. Head on over to our source link for instructions on how to shake those extra coins out. Don't want to commit to a full transaction yourself? Hit the break for a quick video refresher of how in-app purchases work.