title: paypal notify_url issue with codeigniter
body: <p>i try to install paypal payment in my website, but i have an issue with notify_url</p>
  
  <p>i have a form that sent users to paypal's website for the payment process, with this hidden field:</p>
  
  <pre><code>&lt;input name="notify_url" type="hidden" value="http://www.mysite.com/order/autoresponse" /&gt;
  </code></pre>
  
  <p>After the payment success, even if i put this code in the autoresponse page, nothing happens:</p>
  
  <pre><code>$this-&gt;load-library('email');
  $this-&gt;email-&gt;clear();
  $this-&gt;email-&gt;from('noreply@mysite.com', 'My name');
  $this-&gt;email-&gt;to('my@email.com'); 
  $this-&gt;email-&gt;subject('Email Test');
  $this-&gt;email-&gt;message('Testing the paypal payment response.');  
  $this-&gt;email-&gt;send();
  </code></pre>
  
  <p>Any idea?</p>