private function _convertListOrders($request) {

        $parameters = array();
        $parameters['Action'] = 'ListOrders';
        if ($request->isSetSellerId()) {
            $parameters['SellerId'] =  $request->getSellerId();
        }
        if ($request->isSetMWSAuthToken()) {
            $parameters['MWSAuthToken'] =  $request->getMWSAuthToken();
        }
        if ($request->isSetCreatedAfter()) {
            $parameters['CreatedAfter'] =  $request->getCreatedAfter();
        }
        if ($request->isSetCreatedBefore()) {
            $parameters['CreatedBefore'] =  $request->getCreatedBefore();
        }
        if ($request->isSetLastUpdatedAfter()) {
            $parameters['LastUpdatedAfter'] =  $request->getLastUpdatedAfter();
        }
        if ($request->isSetLastUpdatedBefore()) {
            $parameters['LastUpdatedBefore'] =  $request->getLastUpdatedBefore();
        }
        if ($request->isSetOrderStatus()) {
            $parameters['OrderStatus'] =  $request->getOrderStatus();
        }
        if ($request->isSetMarketplaceId()) {
            $parameters['MarketplaceId'] =  $request->getMarketplaceId();
        }
        if ($request->isSetFulfillmentChannel()) {
            $parameters['FulfillmentChannel'] =  $request->getFulfillmentChannel();
        }
        if ($request->isSetPaymentMethod()) {
            $parameters['PaymentMethod'] =  $request->getPaymentMethod();
        }
        if ($request->isSetBuyerEmail()) {
            $parameters['BuyerEmail'] =  $request->getBuyerEmail();
        }
        if ($request->isSetSellerOrderId()) {
            $parameters['SellerOrderId'] =  $request->getSellerOrderId();
        }
        if ($request->isSetMaxResultsPerPage()) {
            $parameters['MaxResultsPerPage'] =  $request->getMaxResultsPerPage();
        }
        if ($request->isSetTFMShipmentStatus()) {
            $parameters['TFMShipmentStatus'] =  $request->getTFMShipmentStatus();
        }

        return $parameters;
    }