According to Apple (see WWDC 2011 Session 510 , in App Purchase for iOS and OS X, at 48:55), only what you can do as a developer to prevent auto-renewal subscriptions:
- Raise the price.
- Extract the automatically updated IAP product from iTunes connect.
In both cases, notification emails are sent to subscribers, but not immediately. The conversation says that Apple checks 10 days before the (annual) renewal of the subscription and sends an email at this time. However, it is not documented anywhere, so I would consider this as an implementation detail.
I did the last (uninstalling the product) several times using my (monthly) applications and it seemed to work as advertised.
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