title: PayPal ipn notify_url on different sites
body: <p><br>
  I'm planning to implement paypal ipn on multiple sites. But since on<br>
  Paypal Payment preferences we can specify only ONE url I must find<br>
  an alternative way.<br>
  <br>
  First way is to implement a _POST broadcast (specify a main ipn url for<br>
  all sites and redirect _POST variables to the correct site's ipn depending<br>
  on a certain condition);<br>
  <br>
  Second way is to specify a different notify_url on each site's form like:<br>
  On Site1.com<br></p>
  
  <pre><code>&lt;input type="hidden" name="notify_url" value="http://site1.com/ipn.php"/&gt;
  </code></pre>
  
  <p>On Site2.com<br></p>
  
  <pre><code>&lt;input type="hidden" name="notify_url" value="http://site2.com/ipn.php"/&gt;
  </code></pre>
  
  <p>I read that if I specify a notify_url on the paypal form then it will<br>
  overwrite the ipn url saved on paypal account settings.<br>
  Is that correct?<br> Is that a reliable way?<br><strong>strong text</strong></p>
  
  <p>Lets say the ipn url on my paypal settings is<br>
  <a href="http://mypersonalwebsite.com/ipn.php" rel="nofollow">http://mypersonalwebsite.com/ipn.php</a><br>
  Thank you a lot.</p>