Hi any update on this how can I cancel my non renewable plan using StoreKit?

Hi I need to implement in app purchase in my application. I have some query. please reply me as soon as possible. 1. Can I make user to purchase non-renewable plan again and again. if yes then how apple manage if user have same plan before or if not then how can I add duration in non-renewable plan so that user can subscribe again with same plan after that time. How can I cancel user cancel their non-renewable plan from the app so that he can purchase different plan or same plan. If user can not cancel plan from the app then how can I inform my own server that user canceled their subscription plan so that if user logged in from different platform like android then my server knowing about the subscription status. If I can't add the duration is non renewable product then what is the difference between consumables and non renewable product. If I need to provide user to option to choose plan so that they can unlock functionality of app for period of time. after that time they need to select plan again. then in this can which product I will choose consumables or non renewable? Thanks in advance . Please reply me as soon as possible.