function getUnsubscribersCount(
        $fromDate = null,
        $toDate = null,
        $mailingIds = null,
        $contactIds = null,
        $contactEmails = null,
        $contactExternalIds = null,
        $source = null)
    {
        $params = $this->createCountQueryParameters($fromDate, $toDate, $contactIds, $contactEmails, $contactExternalIds, $mailingIds, $source);

        return $this->get('reports/unsubscriptions/count', $params);
    }