Detecting Paypal Subscription Cancellation

Question

I have written a simple paypal subscription system, where a user can enter their information, click the button, and start a subscription. Im wondering how I can find out whe

Answer 1

The IPN with a type of 'subscr_cancel' is sent when the user actually cancels the subscription. This should not be used to cancel the subscription as this can happen anytime during the subscription period.

The IPN with the 'subscr_eot' type should be used to cancel the subscription. This is sent when the user's subscription period has expired.