What is the minimum target iOS version for auto-renewal subscription?

Question

Is there a minimum version of iOS that is needed to support automatic renewable subscription? I know that this feature was introduced in iOS 4.3, but I don’t see anything in it, which seems to make it work only on devices 4.3 and later. Has anyone successfully implemented automatic renewable subscriptions in older versions of iOS?

Answer 1

In the end, an Apple engineer provided the answer:

Auto-renewable subscriptions will only work on iOS 4.2 and higher.