中文流程详解：http://www.cocoachina.com/ios/20111028/3435.html
官方流程详解：https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/StoreKitGuide/PromotingIn-AppPurchases/PromotingIn-AppPurchases.html
官方服务器验证订单详细介绍：https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateRemotely.html
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