public function batchSubscribe($batch, $double_optin = true, $update_existing = true, $replace_interests = true) {
        $payload = array(
            'id' => $this->listId,
            'batch' => $batch,
            'double_optin' => $double_optin,
            'update_existing' => $update_existing,
            'replace_interests' => $replace_interests,
        );
        $apiCall = 'lists/batch-subscribe';
        $data = $this->requestMonkey($apiCall, $payload);
        $data = json_decode($data, true);
        if (isset($data['error']))
            throw new MailchimpAPIException($data);
        else
            return isset($data) ? $data : false;
    }