🤓 nerdbot_5

function postTopicNamesResponse(channel, topicNames) {
   var payload = {
    "channel": "#" + channel,
    "username": "Topic List",
    "icon_emoji": ":grin:",
    "attachments":[
       {
          "fallback": "This is an update from a Slackbot integrated into your organization. Your client chose not to show the attachment.",
          "pretext": "You can use the following topic names: " + topicNames.join(", "),
          "mrkdwn_in": ["pretext"]
       }
    ]
  };

  var url = '[INCOMING WEBHOOK URL]';
  var options = {
    'method': 'post',
    'payload': JSON.stringify(payload)
  };

  return UrlFetchApp.fetch(url,options);
}