public function deleteUserCookie($sShopId = null)
    {
        $myConfig = \OxidEsales\Eshop\Core\Registry::getConfig();
        $sShopId = (!$sShopId) ? \OxidEsales\Eshop\Core\Registry::getConfig()->getShopId() : $sShopId;
        $sSslUrl = $myConfig->getSslShopUrl();
        if (stripos($sSslUrl, 'https') === 0) {
            $blSsl = true;
        } else {
            $blSsl = false;
        }

        $this->_aUserCookie[$sShopId] = '';
        $this->setOxCookie('oxid_' . $sShopId, '', \OxidEsales\Eshop\Core\Registry::getUtilsDate()->getTime() - 3600, '/', null, true, $blSsl);
        $this->setOxCookie('oxid_' . $sShopId . '_autologin', '0', \OxidEsales\Eshop\Core\Registry::getUtilsDate()->getTime() - 3600, '/', null, true, false);
    }