title: Amazon MWS SubmitFeed _UPLOAD_VAT_INVOICE_ metadata
body: <p>I use Amazon MWS SubmitFeed for sending tracking numbers and want to use it now for uploading invoices, pdf. The metadata, metadata:shippingid or metadata:orderid, mus be added, but I have no idea where. To the header?</p>
  <pre><code>Host: mws.amazonservices.de\r\nx-amazon-user-.... + metadata:shippingid=XXXXX\r\n
  </code></pre>
  <p>Or in URI/URL?</p>
  <pre><code>CString url= L&quot;POST\nmws.amazonservices.de\n/\nAWSAccessKeyId=&quot;;
      url += AmazonMWS::GetInstance().GetAccessKey();
      url += L&quot;&amp;Action=SubmitFeed&quot;;
  
      url += L&quot;&amp;ContentMD5Value=&quot;;
      url += md5sum;
  
  url += &amp;metadata:shipping=XXXX....
  </code></pre>
  <p>I have no idea. Sorry. Does anybody knows where this elements are added to? I use WinHttp.</p>