castopod/app/Libraries/ActivityPub/Activities/UndoActivity.php

<?php

/**
 * Activity objects are specializations of the base Object type that provide information about actions that have either
 * already occurred, are in the process of occurring, or may occur in the future.
 *
 * @copyright  2021 Podlibre
 * @license    https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
 * @link       https://castopod.org/
 */

namespace ActivityPub\Activities;

use ActivityPub\Core\Activity;

class UndoActivity extends Activity
{
    protected string $type = 'Undo';
}