class-settings.php

<?php
class wp_slack_woocommerce_settings extends wp_slack_woocommerce
{
	public function init()
	{
		add_filter('woocommerce_settings_tabs_array', array($this, 'woo_new_section_tabs'), 50);
		add_action('woocommerce_settings_tabs_settings_slack_woocommerce', array($this, 'settings_tab'));
		add_action('woocommerce_update_options_settings_slack_woocommerce', array($this, 'update_settings'));
	}

	public static function get_settings()
	{
		$settings = array(
			'section_title' => array(
				'name' => __('Slack Notifications', 'wp-slack-woocommerce'),
				'type' => 'title',
				'desc' => '',
				'id' => 'wc_settings_tab_slack_woocommerce_title'
			),
			'notifications_enable' => array(
				'name' => __('Enable Notifications', 'wp-slack-woocommerce'),
				'type' => 'checkbox',
				'desc' => __('Enable Slack Notifications using the settings below', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_woocommerce_enable_notifications'
			),

			'title' => array(
				'name' => __('Slack Token', 'wp-slack-woocommerce'),
				'type' => 'text',
				'desc' => __('', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_token'
			),
			'channel' => array(
				'name' => __('Slack Channel', 'wp-slack-woocommerce'),
				'type' => 'text',
				'desc' => __('', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_woocommerce_channel'
			),
			'icon-confirm' => array(
				'name' => __('Confirmed Icon', 'wp-slack-woocommerce'),
				'type' => 'text',
				'desc' => __('', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_woocommerce_slack_icon_completed'
			),
			'icon-cancel' => array(
				'name' => __('Cancelled Icon', 'wp-slack-woocommerce'),
				'type' => 'text',
				'desc' => __('', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_woocommerce_slack_icon_cancelled'
			),
			'icon-fail' => array(
				'name' => __('Failed Icon', 'wp-slack-woocommerce'),
				'type' => 'text',
				'desc' => __('', 'wp-slack-woocommerce'),
				'id' => 'wc_settings_tab_slack_woocommerce_slack_icon_failed'
			),
			'test_slack' => array(
				'name' => __('', 'wp-slack-woocommerce'),
				'type' => 'title',
				'desc' => '<a href="#" id="test_slack">Test slack</a>',
				'id' => 'wc_settings_tab_slack_test_slack'
			),
			'section_end' => array(
				'type' => 'sectionend',
				'id' => 'wc_settings_tab_slack_woocommerce_end'
			)
		);
		return apply_filters('wc_settings_tab_slack_woocommerce', $settings);
	}
	public function woo_new_section_tabs($sections)
	{
		$sections['settings_slack_woocommerce'] = __('Slack Notifications', 'wp-slack-woocommerce');
		return $sections;
	}
	public function update_settings()
	{
		woocommerce_update_options($this->get_settings());
	}
	public function settings_tab()
	{
		woocommerce_admin_fields($this->get_settings());
	}
}