chamilo-lms/plugin/buycourses/uninstall.php

<?php
/* For license terms, see /license.txt */

/**
 * This script is included by main/admin/settings.lib.php when unselecting a plugin
 * and is meant to remove things installed by the install.php script in both
 * the global database and the courses tables
 * @package chamilo.plugin.buycourses
 */
/**
 * Queries
 */
require_once __DIR__.'/config.php';
BuyCoursesPlugin::create()->uninstall();