public static function findMemberCampaign($membershipID, $campaignID) {
    $connection = \Drupal::service('database');
    /** @var \Drupal\Core\Database\Query\Select $query */
    $query = $connection->select('openy_campaign_member', 'm');
    $query->condition('m.membership_id', $membershipID);
    $query->join('openy_campaign_member_campaign', 'mc', 'm.id = mc.member');
    $query->condition('mc.campaign', $campaignID);
    $query->fields('mc', ['id']);
    $memberCampaignRes = $query->execute()->fetchField();

    return (!empty($memberCampaignRes)) ? $memberCampaignRes : FALSE;
  }