code: public function deregisterDestination($request)
      {
          if (!($request instanceof MWSSubscriptionsService_Model_DeregisterDestinationInput)) {
              require_once (dirname(__FILE__) . '/Model/DeregisterDestinationInput.php');
              $request = new MWSSubscriptionsService_Model_DeregisterDestinationInput($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'DeregisterDestination';
          $httpResponse = $this->_invoke($parameters);
  
          require_once (dirname(__FILE__) . '/Model/DeregisterDestinationResponse.php');
          $response = MWSSubscriptionsService_Model_DeregisterDestinationResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: Deregister Destination
  Delete a destination.
  
  @param mixed $request array of parameters for MWSSubscriptionsService_Model_DeregisterDestination request or MWSSubscriptionsService_Model_DeregisterDestination object itself
  @see MWSSubscriptionsService_Model_DeregisterDestinationInput
  @return MWSSubscriptionsService_Model_DeregisterDestinationResponse
  
  @throws MWSSubscriptionsService_Exception