The Android Developers site can send in-app billing requests and manage in-app billing transactions using the Android Market. It has a sample application that shows the user how to do several in-app billing implementations. It is available now at
The sample shows you how to handle synchronous responses from the Android Market application, and asynchronous responses (broadcasts intents) from your Android Market application. It also shows you how to use in-app security mechanisms for the integrity of billing responses, and even how to create a UI that allows users to select items for purchase.
This sample includes ...