How can I connect Shopify webhooks with NestJs effectively?

Shopify Apps
1

I am working to connect Shopify webhook to nestjs. Although I made the app and made the connection to Shopify and installed the app.

Meanwhile, i have created the endpoint in my nestjs application, but it is not reflecting anything from Shopify

here are the files below

shopify-orders.service.ts

import "@babel/polyfill";
import { Injectable, BadRequestException, ServiceUnavailableException } from '@nestjs/common';
import "isomorphic-fetch";
import dotenv from "dotenv";
import Koa from 'koa';
const { default: createShopifyAuth } = require('@shopify/koa-shopify-auth');
import { default as Shopify, ApiVersion } from '@shopify/shopify-api';
const { verifyRequest} = require('@shopify/koa-shopify-auth');
// const { default: Shopify, ApiVersion } = require('@shopify/shopify-api');
const Router = require('koa-router');
import {receiveWebhook, registerWebhook} from '@shopify/koa-shopify-webhooks';
const session = require('koa-session');
const app = new Koa();
const router = new Router();

@Injectable()
export class ShopifyOrdersService {
    constructor() {}

    public ShopifyApiCalls = () => {
        const app = new Koa();
        const router = new Router();

    const constport = parseInt(process.env.PORT, 10) || 3000;
    const dev = process.env.NODE_ENV !== "production";
    const { SHOPIFY_API_SECRET, SHOPIFY_API_KEY, SCOPES } = process.env;
    app.use(
        createShopifyAuth({ 
            apiKey: SHOPIFY_API_KEY, 
            secret: SHOPIFY_API_SECRET,
            scopes : [SCOPES],

            async afterAuth(ctx) {
                const { shop, accessToken} = ctx.state.shopify;
                  const handleWebhookRequest = async (topic: string, shop: string, webhookRequestBody: string) => {
        // this handler is triggered when a webhook is sent by the Shopify platform to your application
      }

                const registration = await Shopify.Webhooks.Registry.register({
                    shop,
                    accessToken,
                    path: '/webhooks/orders',
                    topic: 'ORDERS_CREATE', 
                    webhookHandler: handleWebhookRequest,
                })
                if (registration.success) {
                    console.log('Successfully registered webhook!');
                  } else {
                    console.log('Failed to register webhook', registration.result);
                  }

                ctx.redirect(`/?shop=${shop}`);

            }
        })
    )

    app.use(
        receiveWebhook({
            path:'/webhooks/orders',
            secret: SHOPIFY_API_SECRET,
            onReceived(ctx) {
                console.log('received webhook: ',ctx.state.webhook);
            },
        }),
    );
    app.use(verifyRequest());

    app.use(ctx => {
    }); 
}
}

shopify-orders.controller.ts

import "@babel/polyfill";
import {   BadRequestException,
    Body,
    Controller,
    Get,
    Headers,
    HttpCode,
    HttpStatus,
    Post,
    Query, } from '@nestjs/common';
import { ShopifyOrdersService } from './shopify-orders.service';

@Controller('webhooks')
export class ShopifyOrdersController {
    public constructor(
        private readonly shopifyOrdersService: ShopifyOrdersService
    ) {}

    ('orders')
    getHello(): any {
        return this.shopifyOrdersService.ShopifyApiCalls();
    }

}

shopify-orders.module.ts

import { Module } from '@nestjs/common';
import { ShopifyOrdersController } from './shopify-orders.controller';
import { ShopifyOrdersService } from './shopify-orders.service';
import { ApiCallsModule } from '../api-calls/api-calls.module'

@Module({
  imports: [
    ApiCallsModule
  ],
  controllers: [ShopifyOrdersController],
  providers: [ShopifyOrdersService]
})
export class ShopifyOrdersModule {}

i dont know what i am missing, thanks