Just Enter Only The Gateway URL Attributes by <code>,</code> and values by <code>=</code> 
        
        <h3 style="margin:10px 0;">Available Tags : </h3>
        <ul style="margin:0;">
            <li><strong> Message Content : </strong> <code> %message%</code></li>
            <li><strong> To Number : </strong>  <code>%tonumber%</code></li>
            <li><strong> Sender ID :  </strong> <code>%senderid%</code></li>
        </ul>
        
    