In app purchase 资料收集

http://www.raywenderlich.com/2797/introduction-to-in-app-purchases

最经典，有图有代码！

http://www.cnblogs.com/zilongshanren/archive/2012/01/15/2190193.html

这是中译版，向作者子龙山人致敬！

http://troybrant.net/blog/2010/01/in-app-purchases-a-full-walkthrough/

这篇也不错

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http://xcodenoobies.blogspot.com/2012/04/implementing-inapp-purchase-in-xcode.html

代码居然不能打开

http://maniacdev.com/2010/03/great-step-by-step-store-kit-in-app-purchase-tutorial/