code: public function listRegisteredDestinations($request)
      {
          if (!($request instanceof MWSSubscriptionsService_Model_ListRegisteredDestinationsInput)) {
              require_once (dirname(__FILE__) . '/Model/ListRegisteredDestinationsInput.php');
              $request = new MWSSubscriptionsService_Model_ListRegisteredDestinationsInput($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'ListRegisteredDestinations';
          $httpResponse = $this->_invoke($parameters);
  
          require_once (dirname(__FILE__) . '/Model/ListRegisteredDestinationsResponse.php');
          $response = MWSSubscriptionsService_Model_ListRegisteredDestinationsResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: List Registered Destinations
  List all the destinations for the specified seller created by the developer.
  
  @param mixed $request array of parameters for MWSSubscriptionsService_Model_ListRegisteredDestinations request or MWSSubscriptionsService_Model_ListRegisteredDestinations object itself
  @see MWSSubscriptionsService_Model_ListRegisteredDestinationsInput
  @return MWSSubscriptionsService_Model_ListRegisteredDestinationsResponse
  
  @throws MWSSubscriptionsService_Exception