public function getCountryISO3()
    {
        $oOrder = $this->getOrder();
        if ($oOrder) {
            $oCountry = oxNew(\OxidEsales\Eshop\Application\Model\Country::class);
            $oCountry->load($oOrder->oxorder__oxbillcountryid->value);

            return $oCountry->oxcountry__oxisoalpha3->value;
        }
    }