public function Summary($from, $to, $channelName = null, $interval = \ElasticEmailEnums\IntervalType::Summary, $transactionID = null) {
        return $this->sendRequest('log/summary', array(
                    'from' => $from,
                    'to' => $to,
                    'channelName' => $channelName,
                    'interval' => $interval,
                    'transactionID' => $transactionID
        ));
    }