/**
 * Function to get the status of the feed submitted through MWS identified by 
 * ReferenceID returned when feed was submitted.
 * @param referenceId string
 * @returns true: if the feed's processing was successful
 *	   false: if the feed's processing was pending/unsuccessful with errors
 * Added  for checking the status of the submitted requests (used by polling)
 */
 public function getRequestStatus($referenceId)
 {
     $country = Mage::getStoreConfig('payment/amazonpayments_cba/country');
     if ($country == "US") {
         $serviceUrl = Mage::getStoreConfig('payment/amazonpayments_cba/mws_service_url_US');
         $marketplace_id = Mage::getStoreConfig('payment/amazonpayments_cba/marketplace_id_US');
     } elseif ($country == "UK") {
         $serviceUrl = Mage::getStoreConfig('payment/amazonpayments_cba/mws_service_url_UK');
         $marketplace_id = Mage::getStoreConfig('payment/amazonpayments_cba/marketplace_id_UK');
     } elseif ($country == "DE") {
         $serviceUrl = Mage::getStoreConfig('payment/amazonpayments_cba/mws_service_url_DE');
         $marketplace_id = Mage::getStoreConfig('payment/amazonpayments_cba/marketplace_id_DE');
     }
     Mage::log("In getStatusRequest:");
     $application_name = 'Magento CBA Plugin';
     $application_version = Mage::getVersion();
     $merchant_id = Mage::getStoreConfig('payment/amazonpayments_cba/merchant_id');
     $config = array('ServiceURL' => $serviceUrl, 'ProxyHost' => null, 'ProxyPort' => -1, 'MaxErrorRetry' => 3);
     /************************************************************************
      * Instantiate Implementation of MarketplaceWebService
      * 
      * AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY constants 
      * are defined in the .config.inc.php located in the same 
      * directory as this sample
      ***********************************************************************/
     $service = new MarketplaceWebService_Client($this->getMwsAccessKey(), $this->getMwsSecretKey(), $config, $application_name, $application_version);
     $feedHandle = @fopen('php://memory', 'rw+');
     $parameters = array('Marketplace' => $marketplace_id, 'Merchant' => $merchant_id, 'FeedSubmissionId' => $referenceId, 'FeedSubmissionResult' => $feedHandle);
     $request = new MarketplaceWebService_Model_GetFeedSubmissionResultRequest($parameters);
     $processingStatus = false;
     try {
         $response = $service->getFeedSubmissionResult($request);
     } catch (MarketplaceWebService_Exception $ex) {
         Mage::log("Caught Exception: " . $ex->getMessage() . "\n");
         Mage::log("Response Status Code: " . $ex->getStatusCode() . "\n");
         Mage::log("Error Code: " . $ex->getErrorCode() . "\n");
         Mage::log("Error Type: " . $ex->getErrorType() . "\n");
         Mage::log("Request ID: " . $ex->getRequestId() . "\n");
         Mage::log("XML: " . $ex->getXML() . "\n");
         @fclose($feedHandle);
         return $processingStatus;
         //returns false in case of request still in pending status
     }
     rewind($feedHandle);
     $xml = simplexml_load_string(stream_get_contents($feedHandle), 'Varien_Simplexml_Element');
     if ($xml->descend('Message/ProcessingReport/ProcessingSummary/MessagesSuccessful') == "1") {
         Mage::log("Success");
         $processingStatus = true;
         //Sets status to true if and only if the feed was successfully processed
     }
     if ($processingStatus) {
         Mage::log("Returning the state of " . $referenceId . " !");
     }
     @fclose($feedHandle);
     return $processingStatus;
 }