title: Customize the inputs for paypal payment
body: <p>I am using the paypal form below. I made some changes so that I could get some custom input fields. I want a field name quantity or numbers which will be a dropdown menu. When the user selects one option from it, and clicks on buy now, he/she will be redirected to the paypal page and the price will be displayed with the multiplication of actual price with quantity.</p>
  
  <pre><code>&lt;form action="https://www.paypal.com/cgi-bin/webscr" method="post"&gt;  
                  &lt;input type="hidden" name="cmd" value="_xclick"&gt;  
                  &lt;input type="hidden" name="business" value="dsfddgdr@gmail.com"&gt;
                  Ad Type:&lt;input type="text" readonly="readonly" name="item_name" value="&lt;?php echo $product; ?&gt;"&gt; &lt;br/&gt; 
                  &lt;!-- &lt;input type="hidden" name="item_number" value="1"&gt;   --&gt;
                  &lt;!-- &lt;input type="text" name="Ad_Type" value="1"&gt; --&gt;
                  Price:&lt;input type="text" readonly="readonly" name="amount" value="$&lt;?php echo $price; ?&gt;"&gt; 
                   &lt;strong&gt;Which tutorial are you donating for?&lt;/strong&gt;&lt;br /&gt;  
                  &lt;select name="item_quantity"&gt;  
                    &lt;option value="1"&gt;1&lt;/option&gt;  
                    &lt;option value="2"&gt;2&lt;/option&gt;  
                    &lt;option value="3"&gt;3&lt;/option&gt;  
                  &lt;/select&gt;   
                  &lt;input type="hidden" name="no_shipping" value="0"&gt;  
                  &lt;input type="hidden" name="no_note" value="1"&gt;  
                  &lt;input type="hidden" name="currency_code" value="USD"&gt;  
                  &lt;input type="hidden" name="lc" value="AU"&gt;  
                  &lt;input type="hidden" name="bn" value="PP-BuyNowBF"&gt;  
                  &lt;input type="hidden" name="return" value="domain.com/success.php?ad_id=&lt;?php echo $ad_id; ?&gt;&amp;user_id=&lt;?php echo $user_id; ?&gt;&amp;ad_level=&lt;?php echo $ad_level; ?&gt;&amp;ad_duration=&lt;?php echo $ad_duration; ?&gt;"&gt;  
  
                  &lt;input type="image" src="paypal_checkout_EN.png" 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_AU/i/scr/pixel.gif" width="1" height="1"&gt;  
              &lt;/form&gt;  
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/uyzeM.png" alt="enter image description here"></p>
  
  <p>I am stuck. It is showing me the select field but how do I make it to work in the paypal page??</p>