title: Amazon Product Advertising API, how to tell if product is supplied by Amazon
body: <p>I'm using the Amazon Product Advertising API to get products for my site. I need to be able to tell if the new items in the response are coming from Amazon or from a third party. It appears that until 11/01/2012 API this was possible through:</p>
  
  <pre><code>&lt;ItemLookupResponse&gt;
     &lt;Items&gt;
        &lt;Item&gt;
           &lt;Offers&gt;
               &lt;Offer&gt;
                  &lt;Merchant&gt;
                     &lt;MerchantId&gt;ATVPDKIKX0DER&lt;/MerchantId&gt;
                     &lt;Name&gt;Amazon.com&lt;/Name&gt;
  </code></pre>
  
  <p>However the <strong>MerchantId</strong> has now been removed from the Offers response group in the API. 
  <strong>IsFulfilledByAmazon</strong> is another one which has been removed.</p>
  
  <p>The only thing I can find now which could determine if the item was provided by Amazon would be: </p>
  
  <pre><code>&lt;Offer&gt;
     &lt;OfferListing&gt;
        &lt;IsEligibleForSuperSaverShipping&gt;1&lt;/IsEligibleForSuperSaverShipping&gt;
  </code></pre>
  
  <p>, as items with SuperSaverShipping are always supplied by Amazon - but I'm not sure if this is reliable? </p>
  
  <p>Any one got a better idea how to do this?</p>
  
  <p>There is an old article before the API change about how to do this, but is now outdated:<a href="https://stackoverflow.com/questions/7954331/amazon-product-advertising-api-how-do-i-know-which-product-belongs-to-amazon-an">Amazon Product Advertising API, how do I know which product belongs to amazon and which belongs to amazon market place</a> </p>
  
  <p>Thanks</p>