title: Get amazon mws usertoken and call mws api
body: <p>I'm trying to a build a web application for Amazon sellers. I don't understand how to call Amazon MWS API using <code>oauth</code> calling and get user MWS authtoken like Etsy API.</p>
  
  <ol>
  <li>User Clicks Link </li>
  <li>User Signs In </li>
  <li>IRP Presents the Agreement  </li>
  <li>Once Agreed, the key is returned to the MWS token</li>
  </ol>
  
  <p>I've seen several programs do this but I can't find it. There seems to be no documentation on this topic and nobody is talking about it. </p>
  
  <p>How can we implemented IRP?</p>