settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Plugin administration pages are defined here.
 *
 * @package     mod_livepoll
 * @copyright   Copyright (c) 2018 Open LMS (https://www.openlms.net)
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

if ($ADMIN->fulltree) {
    $name = 'livepoll/firebaseapikey';
    $title = get_string('firebaseapikey', 'mod_livepoll');
    $description = get_string('firebaseapikey_desc', 'mod_livepoll');
    $default = '';
    $setting = new admin_setting_configtext($name, $title, $description, $default);
    $settings->add($setting);

    $name = 'livepoll/firebaseauthdomain';
    $title = get_string('firebaseauthdomain', 'mod_livepoll');
    $description = get_string('firebaseauthdomain_desc', 'mod_livepoll');
    $default = '';
    $setting = new admin_setting_configtext($name, $title, $description, $default);
    $settings->add($setting);

    $name = 'livepoll/firebasedatabaseurl';
    $title = get_string('firebasedatabaseurl', 'mod_livepoll');
    $description = get_string('firebasedatabaseurl_desc', 'mod_livepoll');
    $default = '';
    $setting = new admin_setting_configtext($name, $title, $description, $default);
    $settings->add($setting);

    $name = 'livepoll/firebaseprojectid';
    $title = get_string('firebaseprojectid', 'mod_livepoll');
    $description = get_string('firebaseprojectid_desc', 'mod_livepoll');
    $default = '';
    $setting = new admin_setting_configtext($name, $title, $description, $default);
    $settings->add($setting);
}