code: 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);
      }
docs: Count unsubscribers.
  
  @param long $fromDate
  If provided, only the unsubscriptions after the given date will be returned. The value of from_date must be a numeric value representing a point in time milliseconds afterJanuary 1, 1970 00:00:00
  @param long $toDate
  If provided, only the unsubscriptions before the given date will be returned. The value of to_date must be a numeric value representing a point in time milliseconds afterJanuary 1, 1970 00:00:00
  @param array $mailingIds
  Multivalued parameter to filter the unsubscriptions by mailings. Each value must correspond to a mailing id.
  @param array $contactIds
  Multivalued parameter to filter the unsubscriptions by contacts. Each value must correspond to a contact id.
  @param array $contactEmails
  Multivalued parameter to filter the unsubscriptions by email addresses.
  @param array $contactExternalIds
  Multivalued parameter to filter the unsubscriptions by external ids. Each value must correspond to a contacts external id.
  @param string $source
  Filters the unsubscriptions by their source. The source can be an unsubscription link (link), a reply mail (reply) or other.
  
  @return com_maileon_api_Page