Usergroup-Subscription Cancellations

Using PayPal

Once my site is fully operational, it will rely heavily on usergroup subscriptions for revenue.

The only thing I'm unsure of is cancellations. If a user subscribes with a successful payment and manually cancels their subscription later via Paypal, does Composr somehow make contact with Paypal to realize the subscription has been terminated, and is Composr capable of demoting this user when the next payment is due and it doesn't receive payment?

Also, what are the methods of cancelling? Manually via Paypal obviously, but I imagine there is some functionality within Composr to do this locally, or does the user just get referred to PayPal to cancel it? And of course, how does Composr make itself "aware" of these cancellations?

Right, it should be fine. But I would keep an eye on it to confirm it is working as expected.

From the subscriptions page there's a cancel link. However the PayPal cancel happens, PayPal sends an IPN when the subscription ends (I believe when the current term expires, informing the site that no new term will start). Composr responds to the IPN by cancelling the subscription.