Create Web Hook Url In ASP.NET Core Web API


Webhooks are a critical component of modern web development, enabling seamless communication between different applications and services. They facilitate real-time data exchange and event notification, making them invaluable for various use cases, such as integrating third-party services, triggering actions based on specific events, and keeping multiple systems in sync. In this comprehensive guide, we'll walk through the process of creating a POST webhook URL in an ASP.NET Core Web API, covering everything from setup to implementation and testing.

Table of Contents

  1. Setting Up the ASP.NET Core Web API Project
  2. Creating the Post Webhook
  3. Implementing Webhook Handling Logic

Setting Up the ASP.NET Core Web API Project

Before we dive into creating the webhook functionality, let's set up the ASP.NET Core Web API project.

  • Open Visual Studio 2022.
  • Click on "Create a new project."
  • Select "ASP.NET Core Empty Project."
  • Provide a name and location for your project, and click "Create."
  • Now select Framework ".NET 8.0".
  • Click "Create" to generate the project structure.

Creating the Post Webhook

Now, we will start creating the post webhook in the project created above. First, we will add two more files; one is an interface, and the other is a repo class for the logical calculation, as given in the below image.

project structure with new files

As you can see above, we have created two new files, IWebHookRepo and WebHookRepo.

Now, we need to modify the Program.cs file as given below.

using WebHookDemo;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Hello World!");

//Listen for POST webhooks
app.MapPost("/webhook", async (HttpContext context, IWebHookRepo receiveWebook) =>
    using StreamReader stream = new StreamReader(context.Request.Body);
    return await receiveWebook.UpdateTransactionStatus(await stream.ReadToEndAsync(), context);


In the above code, we've defined an endpoint /webhook that listens for HTTP POST requests. When a request is received, the UpdateTransactionMethod action method is invoked, which will send the request to the repo class. You can customize this method to handle the webhook payload according to your application's requirements. We are calling a method UpdateTransactionStatus which is in the IWebHook interface. Now, we will see the method in the interface.

namespace WebHookDemo
    public interface IWebHookRepo
        public Task<int> UpdateTransactionStatus(string root, HttpContext httpContext);

In the above code, we have created a method in the interface IWebHookRepo.

Implementing Webhook Handling Logic

Now, we will implement this interface in the WebHookRepo class. Depending on your use case, you may need to implement specific logic to handle the webhook payload. This could involve processing the data, triggering actions, or updating the state of your application. Modify the UpdateTransactionStatus method to include the necessary business logic to handle the incoming requests.

using System.Data;

namespace WebHookDemo
    public class WebHookRepo: IWebHookRepo
        /// <summary>
        /// </summary>
        /// <param name="root"></param>
        /// <param name="httpContext"></param>
        /// <returns></returns>
        public async Task<int> UpdateTransactionStatus(string root, HttpContext httpContext)
            int result = 0;

            //This is where you would put your actual business logic for receiving webhooks
                //write your logic here
            catch (Exception ex)
                throw ex;
            return result;

In the above code, we implemented the method UpdateTransactionStatus. We can write our logic here that can update transaction status accordingly in our database as well.

Now that the webhook endpoint is set up, it's essential to test it to ensure that it works as expected.

  1. Start the ASP.NET Core Web API project.
  2. Use a tool like Postman to send a POST request to http://localhost:port/webhook.
  3. Include a sample payload in the request body.
  4. Verify that the request is received and processed.


In this article, we've covered the process of creating a POST webhook URL in an ASP.NET Core Web API. Webhooks play a crucial role in enabling seamless communication between different systems and services, facilitating real-time data exchange and event notification. By following the steps outlined in this guide, you can implement webhook functionality in your ASP.NET Core applications and handle incoming webhook requests effectively.

Thank You, and Stay Tuned for More

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