function getUnsubscribers(
        $fromDate = null,
        $toDate = null,
        $mailingIds = null,
        $contactIds = null,
        $contactEmails = null,
        $contactExternalIds = null,
        $source = null,
        $embedFieldBackups = false,
        $pageIndex = 1,
        $pageSize = 100)
    {
        $params = $this->createQueryParameters($pageIndex, $pageSize, $fromDate, $toDate, $contactIds, $contactEmails, $contactExternalIds, $mailingIds, $source, $embedFieldBackups);

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