protected function _getBasketAndSessionHash()
    {
        $oSession = oxRegistry::getSession();
        $oBasket  = $oSession->getBasket();

        return md5(
            $oSession->getId() . serialize( $oBasket ) .
            $this->getUniqueString( self::OXPS_PAYMORROW_ORDER_HASH_SALT )
        );
    }