code: function getUniqueOpensCount(
          $fromDate = null,
          $toDate = null,
          $mailingIds = null,
          $contactIds = null,
          $contactEmails = null,
          $contactExternalIds = null,
          $excludeAnonymousOpens = false)
      {
  
          $params = $this->createCountQueryParameters($fromDate, $toDate, $contactIds, $contactEmails, $contactExternalIds, $mailingIds, null);
  
          if (isset($excludeAnonymousOpens)) $params['exclude_anonymous_opens'] = ($excludeAnonymousOpens == true) ? "true" : "false";
  
          return $this->get('reports/opens/unique/count', $params);
      }
docs: Count unique openers.
  
  @param long $fromDate
  If provided, only the openers 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 openers 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 openers by mailings. Each value must correspond to a mailing id.
  @param array $contactIds
  Multivalued parameter to filter the openers by contacts. Each value must correspond to a contact id.
  @param array $contactEmails
  Multivalued parameter to filter the openers by email addresses.
  @param array $contactExternalIds
  Multivalued parameter to filter the openers by external ids. Each value must correspond to a contacts external id.
  @param bool $excludeAnonymousOpens
  If this is set to true (default), only openers that have not yet been anonymized (due to deletion/unsubscription) are returned.
  @return com_maileon_api_Page