title: How to get Response from Paypal when Payment is cancelled
body: <p>I am new in using the paypal api. Now the problem I want to solve is when the payer cancelled the payment on the paypal site is there a way that Paypal will send a response automatically to my site that the payment has been cancelled . my target here is to monitor payments in paypal without always running a script that would request response to Paypal. </p>