Android in-app purchases are coming to the platform and we were able to get a demo by Paul Sebastien of Disney. He showed us how to buy a track pack (Far East Movement, for those who care) in Tap Tap Revenge 4 over 3G on a Nexus S, and using a fake credit card! It's interesting to note that the in-app purchase UI matches the look and feel of the new Android Market and developers can implement the functionality in a few simple steps. In-app purchases should start rolling out in various Android apps this spring. In the meantime, take a look at our video after the break.