private function lookupChannelKey($channelName)
  {

    if ($channelName == '#niche_monitoring') {
      $channelKey = $this->slackConfig['webhookURL_niche_monitoring'];
    } elseif ($channelName == '#after-school-internal') {
      $channelKey = $this->slackConfig['webhookURL_after-school-internal'];
    } else {
      $channelKey = $this->slackConfig['webhookURL_message-broker'];
    }

    return $channelKey;
  }