WooCommerce custom settings page

functions.php

<?php
// Initialize the settings page by including it via the `woocommerce_get_settings_pages` filter
add_filter( 'woocommerce_get_settings_pages', 'hwid_settings_page' );

function hwid_settings_page( $settings ) {
  $settings[] = include( 'Settings.php' );

  return $settings;
}

Settings.php

<?php

namespace RMG\QuoteBuilder;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( class_exists( 'RMG\QuoteBuilder\Settings_Quotes', false ) ) {
	return new Settings_Quotes();
}

/**
 * Settings_Quotes.
 */
class Settings_Quotes extends \WC_Settings_Page {

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->id    = 'quotes';
		$this->label = __( 'Quotes', 'rmgqb' );

		parent::__construct();
	}

	/**
	 * Get sections.
	 *
	 * @return array
	 */
	public function get_sections() {
		$sections = array(
			''             => __( 'General', 'rmgqb' ),
			'pages'    => __( 'Pages', 'rmgqb' ),
			'display' => __( 'Display Options', 'rmgqb' ),
		);

		return apply_filters( 'woocommerce_get_sections_' . $this->id, $sections );
	}

	/**
	 * Output the settings.
	 */
	public function output() {
		global $current_section;

		$settings = $this->get_settings( $current_section );

		\WC_Admin_Settings::output_fields( $settings );
	}

	/**
	 * Save settings.
	 */
	public function save() {
		global $current_section;

		$settings = $this->get_settings( $current_section );
		\WC_Admin_Settings::save_fields( $settings );

		if ( $current_section ) {
			do_action( 'woocommerce_update_options_' . $this->id . '_' . $current_section );
		}
	}

	/**
	 * Get settings array.
	 *
	 * @param string $current_section Current section name.
	 * @return array
	 */
	public function get_settings( $current_section = '' ) {
		if ( 'pages' === $current_section ) {
			$settings = apply_filters(
				'woocommerce_quotes_pages_settings', [
					'section_title'     => [
						'name' => __( 'Quote Pages', 'rmgqb' ),
						'type' => 'title',
						'desc' => '',
						'id'   => 'quote_options',
					],
					'quote_detail_page' => [
						'title'    => __( 'Quote details page', 'rmgqb' ),
						'desc'     => __( 'This the page that the [quotedetails] shortcode exists on.', 'rmgqb' ),
						'id'       => 'rmgqb_detail_page',
						'type'     => 'single_select_page',
						'default'  => '',
						'class'    => 'wc-enhanced-select-nostd',
						'css'      => 'min-width:300px;',
						'desc_tip' => TRUE,
					],
					'section_end'       => [
						'type' => 'sectionend',
						'id'   => 'quote_options',
					],
				]
			);

		} elseif ( 'display' === $current_section ) {
			$settings = apply_filters(
				'woocommerce_quotes_display_settings', [
					'disp_section_title'     => [
						'name' => __( 'Display Options', 'rmgqb' ),
						'type' => 'title',
						'desc' => '',
						'id'   => 'quote_options',
					],
					'quote_show_button' => [
						'title'   => __( 'View Quote Button', 'rmgqb' ),
						'desc'    => __( 'Display the `View Quote` button on the side of the site globally.', 'rmgqb' ),
						'id'      => 'rmgqb_show_quote_button',
						'default' => 'no',
						'type'    => 'checkbox',
					],
					'disp_section_end'       => [
						'type' => 'sectionend',
						'id'   => 'quote_options',
					],
				]
			);

		} else {
			$settings = apply_filters(
				'woocommerce_quotes_settings', apply_filters(
					'woocommerce_quotes_general_settings', [
						[
							'title' => __( 'General Settings', 'rmgqb' ),
							'type'  => 'title',
							'desc'  => '',
							'id'    => 'quote_options',
						],
						'quote_submit_form'     => [
							'name' => __( 'Quote Recipient', 'rmgqb' ),
							'type' => 'text',
							'desc_tip' => 'Defaults to the main site contact if left blank. Multiple recipients can be added by separating their addresses with a comma.',
							'id'   => 'rmg_quote_recipient',
						],
						'form_section_end'       => [
							'type' => 'sectionend',
							'id'   => 'wc_settings_tab_quotesforms_section_end',
						],
						[
							'type' => 'sectionend',
							'id'   => 'quote_options',
						],

					]
				)
			);
		}

		return apply_filters( 'woocommerce_get_settings_' . $this->id, $settings, $current_section );
	}
}

return new Settings_Quotes();