simple example

activitypub-tribe.php

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+<?php
+/**
+ * Plugin Name: ActivityPub Transformer for The Events Calendar
+ * Description: ActivityPub Transformer for The Events Calendar.
+ * Plugin URI:  https://event-federation.eu/
+ * Version:     1.0.0
+ * Author:      André Menrath
+ * Author URI:  https://graz.social/@linos
+ * Text Domain: activitypub-tribe
+ *
+ * ActivityPub tested up to: 1.2.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Register Tribe Transformer.
+ *
+ * Include fransformer file and register transformer class.
+ *
+ * @since 1.0.0
+ * @param \ActivityPUb\Transformers_Manager $transformers_manager ActivtiyPub transformers manager.
+ * @return void
+ */
+function register_tribe_transformer( $transformers_manager ) {
+
+	require_once( __DIR__ . '/transformers/tribe-transformer.php' );
+
+	$transformers_manager->register( new \Activitypub_Tribe_Transformer() );
+
+}
+add_action( 'activitypub/transformers/register', 'register_tribe_transformer' );

transformers/tribe-transformer.php

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+<?php
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * ActivityPub Tribe Transformer
+ *
+ * @since 1.0.0
+ */
+class Activitypub_Tribe_Transformer extends \Activitypub\Transformer_Base {
+
+	/**
+	 * Get widget name.
+	 *
+	 * Retrieve oEmbed widget name.
+	 *
+	 * @since 1.0.0
+	 * @access public
+	 * @return string Widget name.
+	 */
+	public function get_name() {
+		return 'activitypub-tribe/tribe';
+	}
+
+	/**
+	 * Get widget title.
+	 *
+	 * Retrieve Transformer title.
+	 *
+	 * @since 1.0.0
+	 * @access public
+	 * @return string Widget title.
+	 */
+	public function get_label() {
+		return 'The Events Calendar';
+	}
+
+	/**
+	 * Get supported post types.
+	 *
+	 * Retrieve the list of supported WordPress post types this transformer widget can handle.
+	 *
+	 * @since 1.0.0
+	 * @access public
+	 * @return array Widget categories.
+	 */
+	public function get_supported_post_types() {
+		return [ 'tribe_events' ];
+	}
+
+}