if (loginProvider == 'facebook') {
        if (!req.body.access_token)
            return next(new Models.TelepatError(Models.TelepatError.errors.MissingRequiredField, ['access_token']));
        if (!app.telepatConfig.config.login_providers || !app.telepatConfig.config.login_providers.facebook)
            return next(new Models.TelepatError(Models.TelepatError.errors.ServerNotConfigured,