title: PayPal return URL
body: <p>Here's the code for my Paypal button: </p>
  
  <pre><code>&lt;form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post"&gt;
      &lt;input type="hidden" name="cmd" value="_xclick"&gt;
      &lt;input type="hidden" name="business" value="my@email.com"&gt;
      &lt;input type="hidden" name="lc" value="GB"&gt;
      &lt;input type="hidden" name="button_subtype" value="products"&gt;
      &lt;input type="hidden" name="no_note" value="1"&gt;
      &lt;input type="hidden" name="no_shipping" value="1"&gt;
      &lt;input type="hidden" name="rm" value="0"&gt;
      &lt;input type="hidden" name="return" value="http://www.example.com"&gt;
      &lt;input type="hidden" name="item_name" value="My Item"&gt;
      &lt;input type="hidden" name="amount" value="25.00"&gt;
      &lt;input type="hidden" name="currency_code" value="GBP"&gt;
      &lt;input type="hidden" name="bn" value="PP-BuyNowBF:proceed_btn.gif:NonHosted"&gt;
      &lt;input type="hidden" name="item_number" value="4BD9569402CDE"&gt;
      &lt;input type="image" src="http://www.example.com/image.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online."&gt;
      &lt;img alt="" border="0" src="https://www.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Is it possible to add the <code>item_number</code> to the return URL?</p>
  
  <p>For example, after completing the payment within PayPal the user gets sent back to <code>http://www.example.com?item_number=4BD9569402CDE</code></p>