Multi tool use

Node Js value not showing in notification when testing

I am making a notification using firebase cloud functions with node js and my app made on swift

this is my payload

var payload = {
notification: {
title: (goOfflineTimePeriod,"Inactive for minutes you are now offline"),
body: "Time period for inactive log off can be changed in your settings"


though my notification my notification only shows as; "Inactive for minutes you are now offline", "Time period for inactive log off can be changed in your settings"

so the variable; goOfflineTimePeriod does not show in the notification

I am only new to node js is there a reason why "goOfflineTimePeriod" does not show in the notification?

here is my full node js function code;

exports.goOfflineAlert = functions.firestore
.document('/goneOffline/{uid}')
.onCreate((snap, context) => {

var db = admin.firestore();
var uid = context.params.uid;
const newValue = snap.data();
const goOfflineTimePeriod = newValue.goneOffline;

console.log('uid is',uid)

var cityRef = db.collection('Users').doc(uid);
var getDoc = cityRef.get()
.then(doc => {
if (!doc.exists) {
return console.log('No such document!');
} else {

const newValue = doc.data();
const age = newValue.Age;
const name = newValue['Display Name'];
const fcmToken = newValue.fcmToken;
const goOfflineTimePeriod = newValue.goOfflineTimePeriod;


console.log('Document data:', doc.data(),age,fcmToken,name,goOfflineTimePeriod);

var payload = {
notification: {
title: (goOfflineTimePeriod,"Inactive for minutes you are now offline"),
body: "Time period for inactive log off can be changed in your settings"



}
}


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