send a message to Telegram with Bot from WebApp. Google Apps Script

beep2telegram.gs

var token = "1234697707:AAHGyL2PE...";  // CHANGE1

function doPost(e) {
  var chat_id = -0123456789; // CHANGE1
  var msg = e.parameter.msg;
  if (!msg || msg === '') {
    return returnXml_('no message');
  }
  // uncomment to prevent same messages
  //   if (inMemory_(msg)) {
  //     return returnXml_('sent');
  //   }
  sendMessage2Bot_(msg, chat_id);
  var d = new Date();
  var dd = Utilities.formatDate(
    d,
    Session.getTimeZone(),
    "yyyy-MM-dd HH:mm:ss"
  );
  return returnXml_(dd);
}
function doGet(e) {
  return doPost(e);
}
function returnXml_(text) {
  return ContentService.createTextOutput('<res>'+ text +'</res>').setMimeType(
    ContentService.MimeType.XML
  ); 
}

var telegramUrl = "https://api.telegram.org/bot" + token; 
function testSend() {
  // Telegram Bot API 
  // supports only these tags: 
  //        b, i, a, code, pre
  sendMessage2Bot_(
    'Hello,\n' + 
    '<b>bold</b>\n' +
    '<strong>strong💪🏼</strong>\n' +
    '<a href = "https://twitter.com/max__makhrov">url</a>\n' +
    '<i>italic</i>\n' +
    '<em>emphasized</em>\n\n' +
    '<code>code\nis multiline</code>\n\n' +
    '<pre>pre\nis multiline</pre>',
    -0123456789);  // CHANGE1
}
function sendMessage2Bot_(msg, chat_id) {
 var text =
  encodeURIComponent(msg).
  replace(/(?:\r\n|\r|\n)/g, '\\n');
  text = msg;
 chat_id = chat_id || GROUP0_CHAT_ID;
 var data = {
    "text" : text,
    "parse_mode": 'html'
  };
  var payload = JSON.stringify(data);
  var options = {
    "method" : "POST",
    "contentType" : "application/json",
    "payload" : payload,
    "muteHttpExceptions": true
  };
  var url = telegramUrl + "/sendMessage?chat_id=" + chat_id;
  var response = UrlFetchApp.fetch(url, options);
  // var url = telegramUrl + "/sendMessage?chat_id=" + chat_id + "&text="+ text;
  console.log(response.getContentText()); 
}

// prevent dupes
function inMemory_(msg) {
  var key = 'telebeep1';
  var c = CacheService.getScriptCache();
  var mem = c.get(key);
  var o;
  if (mem) {
    o = JSON.parse(mem);
  } else {
    o = {};
  }
  var res = false;
  if (o[msg]) {
    res = true;
  }
  o[msg] = 1;
  c.put(key, JSON.stringify(o), 21600);
  return res;
}