How to build webhooks using NestJS

npm i -g @nestjs/cli 
nest new webhook-app

// app.service.ts

   import { Injectable } from '@nestjs/common'; 
    
   @Injectable() 
   export class AppService { 
     createOrder(data) { 
       // Implementation of order creation
       return data; 
     } 
   } 

   // app.controller.ts

   import { Body, Controller, Post } from '@nestjs/common'; 
   import { AppService } from './app.service'; 
    
   @Controller() 
   export class AppController { 
     constructor(private readonly appService: AppService) {} 
    
     @Post('/order') 
     createOrder(@Body() data) { 
       const createdOrder = this.appService.createOrder(data); 
       return createdOrder; 
     } 
   }

npm install @engagespot/node

// app.service.ts
   
     import { Injectable } from '@nestjs/common';
     import { EngagespotClient } from "@engagespot/node";
    
     @Injectable() 
     export class AppService {
       private engagespotClient;
     
       constructor() {
         this.engagespotClient = EngagespotClient({
           apiKey: 'YOUR_ENGAGESPOT_API_KEY',
           apiSecret: 'YOUR_ENGAGESPOT_API_SECRET'
         });
       }
     
       createOrder(data) { 
         // Implementation of order creation
     
         // Send Engagespot notification for the new order
         this.sendEngagespotNotification(data);
     
         return data; 
       } 
     
       private sendEngagespotNotification(orderData) {
         // Construct Engagespot notification payload
         const notificationPayload = {
           notification: {
             title: "Order generated",
             message: `New order created with ID ${orderData.orderId}`,
             url: `https://support.mydomain.com/orders/${orderData.orderId}`,
           },
           sendTo: {
             recipients: [orderData.userId] // Assuming userId is available in order data
           }
         };
     
         // Send notification using Engagespot client
         this.engagespotClient.send(notificationPayload);
       }
     }

import { EngagespotClient } from '@engagespot/node';

     const client = EngagespotClient({
       apiKey: 'ENGAGESPOT_API_KEY',
       apiSecret: 'ENGAGESPOT_API_SECRET',
     });

     client.createOrUpdateUser('identifier', {
         webhookUrl: 'your webhook URL',
     });

 npm run start

   POST /order HTTP/1.1
   Host: localhost:3000
   Content-Type: application/json
   
   {
       "userId": "123",
       "orderId": "789", // Add orderId if available in your order data
       "productId": 1,
       "amount": 1,
       "deliveryAddress": "Fake Street 123"
   }