Auto-renewal cancellation notification: iOS PAYMENT

How can we cancel the Renewable auto volume from itunes and receive a call on our server? After it is canceled with itunes, I have to get a notification on my server or on my phone so that I can cause the cancellation to be unsubscribed on my server.

I read something like this somewhere

"When you click on the Apple server with the last receipt you saved, it will return the code to cancel your subscription."

I doubt:

Is there any specific error code returned if my subscription is canceled?

I have a cancel button inside my application to cancel a subscription. What I think of this is to redirect to this option -> manage the subscription page for now. After cancellation How can I get a notification about this?

OR, should I install cron in the backend to verify cancellation?

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