Microsoft
MSDN Virtual Lab: Windows 8 RTM: Lab 8 - The Windows Store APIs – JavaScript
What you’ll learn in this lab
After completing this lab, you will be better able to detect whether your app is running as a trial version, simulate purchases of the app from within the app itself, simulate in-app purchases of additional products and retrieve licensing information regarding apps and products.
What are Virtual Labs? MSDN Virtual Labs enable you to experience a software product or technology using a cloud based private virtual machine environment. You will be presented with a series of instructions, and access to one or more virtual machines, with no additional software or setup required.