public function purge($objectID, $categoryConst, $entryID = null) {
        $params = [
            'object' => $objectID,
            'category' => $categoryConst
        ];

        if (isset($entryID)) {
            $params['entry'] = $entryID;
        }

        $this->api->request(
            'cmdb.category.purge',
            $params
        );

        return $this;
    }