public function timeToLive($id, $keys = false)
    {
        $params = [
            'ID' => $id,
            'keys' => $keys,
        ];

        $body = $this->request(self::URI_TIMETOLIVE, $params);

        if (isset($body['keys'])) {
            $body['keys'] = array_map(function($value) {
                return base64_decode($value);
            }, $body['keys']);
        }

        return $body;
    }