As of recently Google have included in-app payment for Android app developers to make use of. Which now allows app developers to charge for extra content, add-ons, virtual content or merchandise within an app. This new feature which Google stated they had ion the works a while ago, will help to incourage app developers to keep their applications up to date. To clear things up a little we found a little video from Android Central which simply shows how in-app payments work (see below).