Google Script for random quote Line Bot

random_quote_bot.js

function doPost(e) {
  var CHANNEL_ACCESS_TOKEN = '<your channel access token>';
  var msg= JSON.parse(e.postData.contents);
  console.log(msg);

  var replyToken = msg.events[0].replyToken;
  var userMessage = msg.events[0].message.text;

  if (typeof replyToken === 'undefined') {
    return;
  }

  var quotes = ['quote1',
                'quote2',
                'quote3'];
                
  var rdn = Math.floor(Math.random() * quotes.length);

  var url = 'https://api.line.me/v2/bot/message/reply';
  UrlFetchApp.fetch(url, {
      'headers': {
      'Content-Type': 'application/json; charset=UTF-8',
      'Authorization': 'Bearer ' + CHANNEL_ACCESS_TOKEN,
    },
    'method': 'post',
    'payload': JSON.stringify({
      'replyToken': replyToken,
      'messages': [{
        'type': 'text',
        'text': quotes[rdn],
      }],
    }),
  });
}

ref: https://www.oxxostudio.tw/articles/201804/line-bot-apps-script.html