This source code is used for developing an in app purchase application. If you are planning to sell multiple ebooks on similar topic, In app is the right choice. You can make an In App App for similar topic in one app. User can unlock books as and when required by paying directly from your app. Payment and everything is done under your control.
This application open a first screen with Free content which are unlock by default. There are two more buttons at bottom of the screen which are marked as Locked. When user click on the those button, it will open a new screen giving information about that app and also have a button to buy this app.
Once user click on buy button, This app and itunes will communicate and complete the payment transaction. Once the payment successfully complete, Lock content will be unlock and user can easily navigate the Chapter of the book
See this app here
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