Is there a minimum version of iOS that is needed to support auto-renewable subscriptions? I know that feature was introduced in iOS 4.3 but I don't see anything about it that would seem to force it to only work on 4.3 and later devices. Has anyone successfully implemented auto-renewable subscriptions on older versions of iOS?
Eventually an engineer at Apple provided an answer:
Auto-renewable subscriptions will only work on iOS 4.2 and above.
来源：https://stackoverflow.com/questions/6667856/what-is-the-minimum-target-ios-version-for-auto-renewable-subscriptions