how do.....
So the best approach for this is to use IPN (Instant Payment Notification), this system issues a data message out to a URL on your site which includes the subscription data once a user subscribes or unsubscribes.
You can get more details on IPN here:
https://developer.paypal.com/docs/classic/products/instant-payment-notification/
and the Subscription IPN variables are here:
https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/#id091EB0901HT
... View more