protected function defaultExpireDurationParamKey()
    {
        $expireDurationParamKey = 'expires_in';
        foreach ($this->getParams() as $name => $value) {
            if (strpos($name, 'expir') !== false) {
                $expireDurationParamKey = $name;
                break;
            }
        }

        return $expireDurationParamKey;
    }