How to receive and process a notification using a server#

npm i @green-api/whatsapp-api-client

const whatsAppClient = require("@green-api/whatsapp-api-client");

import whatsAppClient from "@green-api/whatsapp-api-client";

import * as whatsAppClient from "@green-api/whatsapp-api-client";

API_TOKEN_INSTANCE = "MY_API_TOKEN_INSTANCE"
ID_INSTANCE = "MY_ID_INSTANCE"

const restAPI = whatsAppClient.restAPI(({
    credentialsPath: "examples\\credentials"
}))

import whatsAppClient from '@green-api/whatsapp-api-client'
import express from "express";
import bodyParser from 'body-parser';

(async () => {
    try {

        // Set http url where webhooks will be sent to. 
        // Url must have a public address.
        await restAPI.settings.setSettings({
            webhookUrl: 'MY_HTTP_SERVER:3000/webhooks'
        });

        const app = express();
        app.use(bodyParser.json());
        const webHookAPI = whatsAppClient.webhookAPI(app, '/webhooks')

        // Subscribe to the webhook event upon a message receipt
        webHookAPI.onIncomingMessageText((data, idInstance, idMessage, sender, typeMessage, textMessage) => {
            console.log(`outgoingMessageStatus data ${data.toString()}`)
        });

        // Start a web server with a public address
        app.listen(3000, async () => {
            console.log(`Started. App listening on port 3000!`)

            const restAPI = whatsAppClient.restAPI(({
                idInstance: MY_ID_INSTANCE,
                apiTokenInstance: MY_API_TOKEN_INSTANCE
            }));
            // Send a text message to trigger webhook events
            const response = await restAPI.message.sendMessage("79999999999@c.us", null, "hello world");

        });
    } catch (error) {
        console.error(error);
        process.exit(1);
    }
})();