Example.php

<?php

/**
 * @package WooCommerce Notifications via Africa's Talking
 * @link https://osen.co.ke
 * @version 0.20.60
 * @since 0.20.40
 * @author Osen Concepts < hi@osen.co.ke >
 */

namespace YourNamespace;

use Osen\Wp\Settings\Base;

class Example
{

    private $settings;

    private $statuses = [
        'created', 'pending', 'failed', 'on-hold', 'processing', 'completed', 'refunded', 'cancelled',
    ];

    public function __construct()
    {
        $this->settings = new Base;

        add_action('admin_init', array($this, 'admin_init'));
        add_action('admin_menu', array($this, 'admin_menu'), 99);
    }

    public function admin_init()
    {

        //set the settings
        $this->settings->set_sections($this->get_settings_sections());
        $this->settings->set_fields($this->get_settings_fields());

        //initialize settings
        $this->settings->admin_init();
    }

    public function admin_menu()
    {
        add_submenu_page(
            'woocommerce',
            'SMS Notifications Via Africa\'s Talking',
            'SMS Notifications',
            'manage_options',
            'at_notify',
            array($this, 'settings_page')
        );
    }

    public function get_settings_sections()
    {
        $sections = array(
            array(
                'id'      => 'gateway',
                'title'   => __('Admin Options', 'woocommerce'),
                'heading' => __('Admin Options', 'woocommerce'),
                'desc'    => 'You can use placeholders such as <code>{first_name}</code>, <code>{last_name}</code>, <code>{order}</code>, <code>{site}</code>, <code>{phone}</code> to show customer names, order number, website name and customer phone respectively.'
            ),
        );
        foreach ($this->statuses as $status) {
            $sections[] = array(
                'id'      => $status,
                'title'   => ucwords($status),
                'heading' => 'On ' . ucwords($status) . ' Status',
                'desc'    => 'You can use placeholders such as <code>{first_name}</code>, <code>{last_name}</code>, <code>{order}</code>, <code>{site}</code>, <code>{phone}</code> to show customer names, order number, website name and customer phone respectively.'
            );
        }

        return $sections;
    }

    /**
     * Returns all the settings fields
     *
     * @return array settings fields
     */
    public function get_settings_fields()
    {
        $settings_fields = array(
            'gateway' => array(
                array(
                    'name'              => 'username',
                    'label'             => __('AT Username', 'woocommerce'),
                    'type'              => 'text',
                    'placeholder'       => 'Your Africa\'s Talking API Username',
                    'sanitize_callback' => 'sanitize_text_field',
                ),
                array(
                    'name'              => 'shortcode',
                    'label'             => __('AT Sender ID', 'woocommerce'),
                    'type'              => 'text',
                    'placeholder'       => 'Your Africa\'s Talking Sender ID',
                    'sanitize_callback' => 'sanitize_text_field',
                ),
                array(
                    'name'              => 'key',
                    'label'             => __('AT API Key', 'woocommerce'),
                    'type'              => 'text',
                    'placeholder'       => 'Your Africa\'s Talking API Key',
                    'sanitize_callback' => 'sanitize_text_field',
                ),
                array(
                    'name'        => 'phones',
                    'label'       => __('Admin Numbers', 'woocommerce'),
                    'desc'        => __('Comma-separated list of numbers to notify on status change', 'woocommerce'),
                    'type'        => 'textarea',
                    'placeholder' => 'E.g 254...,255...,256..',
                ),
            ),
        );

        foreach ($this->statuses as $status) {
            $settings_fields[$status] = array(
                array(
                    'name'  => 'customer_enable',
                    'label' => __('Customer Enable', 'woocommerce'),
                    'desc'  => __('Notify customer on ' . $status . ' status', 'woocommerce'),
                    'type'  => 'checkbox',
                ),
                array(
                    'name'    => 'customer_msg',
                    'label'   => __('Customer Message', 'woocommerce'),
                    'desc'    => __('Message to send to customer for ' . $status . ' status', 'woocommerce'),
                    'type'    => 'textarea',
                    'default' => 'Hello {first_name}, your order on {site} is ' . $status . '.',
                ),
                array(
                    'name'  => 'admin_enable',
                    'label' => __('Admin Enable', 'woocommerce'),
                    'desc'  => __('Notify admin(s) on ' . $status . ' status', 'woocommerce'),
                    'type'  => 'checkbox',
                ),
                array(
                    'name'    => 'admin_msg',
                    'label'   => __('Admin Message', 'woocommerce'),
                    'desc'    => __('Message to send to admin(s) for ' . $status . ' status', 'woocommerce'),
                    'type'    => 'textarea',
                    'rows'    => 2,
                    'default' => 'An order is ' . $status . ' on {site}.',
                ),
            );
        }

        return $settings_fields;
    }

    public function get_option($option, $section = 'gateway', $default = '')
    {
        $options = get_option($section);
        return $options[$option] ?? $default;
    }

    public function settings_page()
    {
        echo '<div class="wrap">';

        echo '<h1>' . esc_html(get_admin_page_title()) . '</h1>';

        $this->settings->show_navigation();
        $this->settings->show_forms();

        echo '</div>';
    }
}