PayPal Subscription - identify the renew and cancel - ASP.Net 4.0 -- 2

Job ID: 32904465

Budget: ₹600 – ₹1,500 INR

I have set up a PayPal subscribe button with ASP.Net 4.0 web form. Now, I want to identify if an user renews his subscription at paypal Or cancel it.
Related categories: ASP C# Programming PayPal API ASP.NET PayPal