I am actully working on Subscriptions(Auto Renewal), I have one doubt regarding the "Restore Purchase" button is it mandatory to provide "Restore Option" in case of auto renewal.
Refering this link , As per the below document its not required.
is it Require to keep Restore Purchase button for auto renewal subscriptions?
You must provide a method whereby a user with a new device can obtain the subscription, purchased in a different device, into that new device - that's called 'restore'. The link you provided indicates that non-renewing subscriptions require the developer to create a 'restore' function but that autorenewable subscriptions support restoreCompletedTransactions. You can also refresh the receipt and obtain the user's autorenewable subscription purchases. But only by exectuting restoreCompletedTransactions can you assure that future autorenewable renewals generate a call to completedTransactions in that new device.