Android Market has launched an in-app payment system.

As promised last week, today the Android Market has launched an in-app billing payment system. Developers can now publish applications that support this system, and users of such applications can make purchases in them.

The system of payments within applications gives developers more opportunities to make a profit from their applications: try-and-buy model, virtual goods, updates and other payment models. If you are not familiar with this system yet, you can learn more about it in the help section of the Android Developers website.

Several applications are already available that use this service, including Disney Mobile's Tap Tap Revenge ; Comics from ComiXology; Gun Bros , Deer Hunter Challenge HD and WSOP3 from Glu Mobile; and Dungeon Defenders: FW Deluxe from Trendy Entertainment.
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To try a new payment system in your applications, start with detailed documentation and a sample application that show how to implement the service in your application. Also, be sure to review the security guidelines to ensure that your implementation is safe.