title: PayPal recurring payment (Subscription button) payment response
body: <p>I'm using recurring payment (subscription button) feature in my web application.</p>
  
  <p>I charge 15 USD \ month for a subscription.</p>
  
  <p>This is the HTML form I got from PayPal's generator:</p>
  
  <pre><code>&lt;form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post"&gt;
      &lt;input type="hidden" name="cmd" value="_s-xclick"&gt;
      &lt;input type="hidden" name="hosted_button_id" value="BUTTON_ID"&gt;
      &lt;input type="image" src="https://www.sandbox.paypal.com/en_US/IL/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"&gt;
      &lt;img alt="" border="0" src="https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Of course I changed the <code>BUTTON_ID</code> field to my real Button ID.</p>
  
  <p>Now, It seems to work fine, but how do I get a notification of a new subscription (not via email) that I can handle by code?</p>
  
  <p>I'm working with ASP.NET 4.0, Javascript &amp; jQuery.</p>
  
  <p>I'd love some help. Thanks!</p>