I have implemented non-consumable subscription in InApp. It is working fine. It shows alert as You have already purchased blah blah but I think It is because i have test user account.
When i tried to implement Auto-renewable with the same method it goes to FailedTransaction method everytime. with the error Cannot connect to iTunes Store" UserInfo=0x11a190 {NSLocalizedDescription=Cannot connect to iTunes Store}
If there is any other method to do then please redirect me. I got the very good steps from this SO question but didn't get any code that how exactly it should be implemented.
This will solve all your confusion towards autorenewable subscription https://github.com/MugunthKumar/MKStoreKit