title: eBay Product API getProductDetails - Product ID value xxxx is not valid for product ID type UPC
body: <p>Attempting to get EPID for products in eBay Motors Parts &amp; Accessories catalog by submitting UPC.</p>
  
  <p>Here is the code for the call:</p>
  
  <pre><code>$appID = 'xxxxxxxxxxxxxxxxx';
  $siteID  = 'EBAY-MOTOR';                            // siteID needed in request
  $verb    = 'getProductDetails';                  // the call being made:
  $version = '1.4.0';                          // eBay API version
  
  ///Build the request XML request which is first part of multi-part POST
  $xmlReq = '&lt;?xml version="1.0" encoding="utf-8"?&gt;' . "\n";
  $xmlReq .= '&lt;' . $verb . 'Request xmlns="http://www.ebay.com/marketplace/marketplacecatalog/v1/services"&gt;' . "\n";
  $xmlReq .= "&lt;productDetailsRequest&gt;\n";
  $xmlReq .= "&lt;dataset&gt;DisplayableProductDetails&lt;/dataset&gt;\n";
  $xmlReq .= "&lt;productIdentifier&gt;&lt;UPC&gt;" . $upc . "&lt;/UPC&gt;&lt;/productIdentifier&gt;\n";
  $xmlReq .= "&lt;/productDetailsRequest&gt;\n";
  $xmlReq .= "&lt;/" . $verb . "Request&gt;";
  
  // Create a new eBay session (defined below) 
  $session = new eBaySession_Product($appID, $version, $siteID, $verb);
  
  $respXmlStr = $session-&gt;sendHttpRequest($xmlReq);   // send multi-part request and get string XML response
  print "respXmlStr: $respXmlStr\n";
  
  if(stristr($respXmlStr, 'HTTP 404') || $respXmlStr == '')
      die('&lt;P&gt;Error sending request');
  
  $respXmlObj = new SimpleXMLElement($respXmlStr);     // create SimpleXML object from string for easier parsing
  </code></pre>
  
  <p>Here is the response:</p>
  
  <pre><code>Outcome: Failure
  ePID:
  Error Id: 18
  Error Domain: Marketplace
  Error Severity: Error
  Error Category: System
  Error Message: Product ID value 841380031426 is not valid for product ID type UPC.
  Error Subdomain: MarketplaceCatalog
  Version: 1.3.1
  Timestamp: 2017-03-29T16:13:43.672Z
  </code></pre>
  
  <p>The call works for products that are not in the Parts &amp; Accessories catalog , e.g. a Harry Potter book but I can't get it to work for any of the auto parts UPC codes. I know that 841380031426 is a valid UPC so I'm stumped. Any help is much appreciated.</p>
  
  <p>Thanks,</p>
  
  <p>Jay</p>
  
  <p>P.S. Already tried the Product-findProducts, Shopping->FindProducts and Finding->findItemsByProduct calls with no success.</p>