The completed template configuration for our Hello World tutorial, updated for v6

hello-world.php

<?php

namespace GFPDF\Templates\Config;

use GFPDF\Helper\Helper_Interface_Config;
use GFPDF\Helper\Helper_Interface_Setup_TearDown;
use GFPDF\Helper\Helper_Abstract_Config_Settings;

/* Exit if accessed directly */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class Hello_World
 *
 * @package  GFPDF\Templates\Config
 *
 * @Internal See https://docs.gravitypdf.com/v6/developers/template-configuration-and-image for more information about this class
 */
class Hello_World extends Helper_Abstract_Config_Settings implements Helper_Interface_Config, Helper_Interface_Setup_TearDown {

	/**
	 * Runs when the template is initially installed via the PDF Template Manager
	 *
	 * @Internal Great for installing custom fonts you've shipped with your template.
	 * @Internal Recommend creating the directory structure /install/Hello_World/ for bundled fonts
	 */
	public function setUp() {

	}

	/**
	 * Runs when the template is deleted via the PDF Template Manager
	 *
	 * @Internal Great for cleaning up any additional directories
	 */
	public function tearDown() {

	}

	/**
	 * Return the templates configuration structure which control what extra fields will be shown in the "Template" tab when configuring a form's PDF.
	 *
	 * @return array The array, split into core components and custom fields
	 */
	public function configuration() {
		return [
			/* Enable core fields */
			'core'   => [
				'footer'           => true,
				'background_image' => true,
			],

			/* Create custom fields to control the look and feel of a template */
			'fields' => [
				'world_show_meta_data' => [
					'id'      => 'world_show_meta_data',
					'name'    => esc_html__( 'Show Meta Data', 'world-pdf-template' ),
					'desc'    => esc_html__( 'When enabled the user IP, timestamp, user agent and source URL will be included in the PDF.', 'world-pdf-template' ),
					'type'    => 'radio',
					'options' => [
						'Yes' => esc_html__( 'Yes', 'world-pdf-template' ),
						'No'  => esc_html__( 'No', 'world-pdf-template' ),
					],
					'std'     => 'No',
				],
			],
		];
	}
}