public function getShipmentTrackingUrl()
    {
        $oConfig = \OxidEsales\Eshop\Core\Registry::getConfig();
        if ($this->_sShipTrackUrl === null) {
            $sParcelService = $oConfig->getConfigParam('sParcelService');
            $sTrackingCode = $this->getTrackCode();
            if ($sParcelService && $sTrackingCode) {
                $this->_sShipTrackUrl = str_replace("##ID##", $sTrackingCode, $sParcelService);
            }
        }

        return $this->_sShipTrackUrl;
    }