public function closeOrderReference($oOrder = null, $aRequestParameters = array(), $blUpdateOrderStatus = true)
    {
        $oData = $this->_callOrderRequest(
            'closeOrderReference',
            $oOrder,
            $aRequestParameters,
            array('amazon_order_reference_id'),
            $blProcessable,
            'AMZ-Order-Closed'
        );

        //Update Order info
        if ($blUpdateOrderStatus === true && $blProcessable === true) {
            $oOrder->assign(array(
                'oxtransstatus' => 'AMZ-Order-Closed'
            ));
            $oOrder->save();
        }

        return $oData;
    }