In-app Purchase Version 3 (IAP V3) makes it easier to integrate In-app Purchase into your android app. There are number of features includes in this version to improved APIs to track ownership of consumable goods, synchronous purchase flow and local caching of in-app purchase data. It also known as Google play In App billing. - See more at: http://www.theappguruz.com/tutorial/implement-in-app-purchase-version-3/#sthash.mAue9bjG.dpuf