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Prior to building a store into your application, you must set up the products and testing environment on iTunes Connect. This will allow you to simulate payment processing without charging your iTunes account each time.
The major prerequisite for setting up products is that you must first add the application you want to test with to iTunes Connect at http://itunesconnect.apple.com. To do this, you must go through all the steps to submit your app for App Store approval. Keep in mind that you shouldn’t upload a binary, so your application isn’t accidently submitted to Apple before it’s ready.