Code_replyMsg.gs

function replyMsg(userId, replyToken, userMsg) {
  var msg = "";
  if (userMsg == "打卡提醒") {   // "Remind me to punch."
    if (checkUser(userId) == -1) {
      addUser(userId);
      msg = "那我以後9:00和18:00會提醒你喔~";  // "I'll remind you at 9:00 and 18:00 in the future."
    } else {
      msg = "你已經在提醒名單中了:)";  // "You're already on the remind list."
    }
  } else if (userMsg == "取消提醒") {   // "Stop reminding me."
    var index = checkUser(userId);
    if (index == -1) {
      msg = "你本來就不在提醒名單中喔!";  // "You're not on the remind list."
    } else {
      deleteRowAt(index);
      msg = "好，以後自己記得打卡喔:)";   // "OK. Please remember to punch on your own."
    }
  }

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