title: Amazon MWS Report Type "_GET_MERCHANT_LISTINGS_DATA_" result attributes meaning
body: <p>In Amazon MWS API, when requesting report of type <strong>"_GET_MERCHANT_LISTINGS_DATA_"</strong>
  What is the difference between the returned attributes:  </p>
  
  <ul>
  <li>product-id</li>
  <li>listing-id</li>
  <li>asin1</li>
  </ul>