UNITY IAP接入

接入Unity自带IAP时，按照官方文档一步步import Unity purchase包。依然会发现两个错误：

1. The name `StandardPurchasingModule' does not exist in the current context。
2. The type or namespace name `IAppleExtensions' could not be found. Are you missing an assembly reference?

解决办法是：Unity目录下 Assets ->Import Package ->Custom Package，选择Assets/Plugins/UnityPurchasing目录下的UnityChannel.unitypackage和UnityIAP.unitypackage。问题解决。

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