public function GetLoginApiForEndUser(string $appKey = NULL, string $loginId = NULL, string $langId = NULL)
    {
        if (GnUtil::IsNullOrEmpty($langId)) {
            $langId = GnSettings::$CurrentLangId;
        }

        $loginApi = new Modules\GnLoginApiEndUser($this, $appKey, $loginId, $langId);

        return $loginApi;
    }