note code for LON in LCT23 / not correct at all

index.js

const { onRequest } = require('firebase-function/v2/https');
const { getFirestore, FieldValue = require('firebase-admin/firestore');
const { initializeApp) = require('firebase-admin/app');
initializeApp();

// 1. import module
const LINE = require(‘./line’);
const TEMPLETE = require(‘./template’);

exports.send = onRequest(async (req, res) => {
    // 2. phone number hashing
    const crypto = require(‘crypto’);
    const hashed = crypto.createHash('sha256').update(`+66${process.env.PHONE_NUMBER}`).digest('hex');
    
    // 3. Write data
    const writeResult = await getFirestore().collection(‘messages’).add({
        status: 'blocked',
        hashed: hashedPhoneNumber,
        createdTime: FieldValue.serverTimestamp
    });
    
    // 4 Send LON 
    const result = await LINE.sendLON(writeResult.id, hashedPhoneNumber, [TEMPLATE.Lct()]);
    
    // 5 Check LON result; not sure for correctly code
    await getFirestore().collection(‘messages’).doc(writeResult.id).update({ status: ‘delivered’ });
    
    res.send(`${result}`);
});

exports.webhook = onRequest(async (req, res) => {
    // 6. Iterate events
    const events = req.body.events;
    // 7. Detect delivery event
    for (const event of events) {
        if (event.type === 'delivery') {
            console.log(event);
            // 8. get docId
            const docId = event.delivery.data;
            // 9. update data
            await getFirestore().collection('messages').doc(docId).update({
                status: 'delivered',
                webhookTime: FieldValue.serverTimestamp()
            });
        }
    }
    res.end();
});

exports.get = onRequest(async (req, res) => {
    // 10. get number of sent
    const result = await LINE.getLON(1);
    res.json(result);
});

line.js

const logger = require("firebase-functions/logger");
const axios = require("axios");

const HEADERS = {
    "Content-Type": "application/json",
    Authorization: Bearer $(process.env.CHANNEL_ACCESS_TOKEN)
}

const sendLON = async(docId, hashedPhoneNumber, msg) => {
    HEADERS ["X-Line-Delivery-Tag"] = docId;
    try {
        const result = await axios({
            method: "post",
            url: "https://api.line.me/bot/pnp/push",
            headers: HEADERS,
            data: { to: hashedPhoneNumber, messages: msg }
        });
        return result.status; 
    } catch(error) {
        logger.warn(error.response.data);
        return error.response.status;
    }
}

const getLON = async(dayBefore) => {
    const yesterday = new Date();
    yesterday.setDate(yesterday.getDate() - dayBefore);
    const ISODate= yesterday.toISOString().split('T')[0];
    try {
        const result = await axios({
            method: "get",
            url: 'https://api.line.me/v2/bot/message/delivery/php?date=${ISODate.replaceAll("","") }`
            headers: HEADERS
        });
        return result.data;
    } catch(error) {
        Logger.warn(error.response.data);
        return error.response.status;
    }
}

module.exports = { sendLON, getLON };