Setup to listen telegram multiple bots on webhooks.

setwebhook.js

const axios = require('axios');
const apiurl = 'https://api.telegram.org/bot';
const serveraddress = 'https://yourdomain.com';
const tokens = ['3445345345:454545-iY_wE6wj_aKDJwKLXk', '453454545:gffgfgzbcfjhsdbflhjdsfvhjlvdsf'];

//set webhook
//you can make this as call as way you want.
webhookURL(tokens, 50, 8443, 'tgram');

async function webhookURL(bot_tokens, max_connections, port, from) {

    const requests = bot_tokens.map((token) => {
        const webhook_url = `${apiurl}${token}/setwebhook?max_connections=${max_connections}&url=${serveraddress}:${port}?${from}=bot${token}`;
        return setWebhook(webhook_url)
            .catch(err => {
                console.log('first error', err);
            });
    })

    await Promise.all(requests)
        .then(response => {
            console.log(response);
        })
        .catch(e => {
            console.log('all error', e);
        })
}

function setWebhook(webhook_url) {
    return new Promise(function(resolve, reject) {
        axios.post(webhook_url)
            .then((response) => {
                resolve(response.data);
            })
            .catch((error) => {
                reject(error.data);
            });
    })
}

webhook.js

var fs = require('fs');
var https = require('https');
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
const TelegramBot = require('node-telegram-bot-api');

//ssl details
//i have copied the cert details from the cpanel.
var privateKey = fs.readFileSync('./ssl/mycert.key', 'utf8');
var certificate = fs.readFileSync('./ssl/mycert.crt', 'utf8');
var caCerts = [
    fs.readFileSync('./ssl/CA_root.crt'),
    fs.readFileSync('./ssl/ca_bundle_certificate.crt')
];

var credentials = {
    key: privateKey,
    cert: certificate,
    ca: caCerts
};

//port to listen
var port = process.env.PORT || 8443;

app.use(bodyParser.urlencoded({
    extended: true
}));
app.use(bodyParser.json());

app.post('/', (req, res) => {
    res.sendStatus(200);
    //console.log(req);
    var query = req.originalUrl.split('=');
    //get bot token from the webhook
    var token = query[1].substring(3);
    //get webhook from
    var from = query[0].substring(2);
    //body of the message.	
    var msg = req.body;
    console.log(msg);
    var telegram_id = msg.message.chat.id;

    switch (from) {
        case ('tgram'):
            const bot = new TelegramBot(token);
            bot.sendMessage(telegram_id, 'You are live on webhook.')
            break;

        default:
            console.log('Webhook response from unknown source', msg);
    }
})

var httpsServer = https.createServer(credentials, app);
httpsServer.listen(port, function() {
    console.log('Webhook server started on: ' + port)
});