Webhook notification callback C#

The code you posted above is just for subscribing for the notification. The Webhook callback is running on the server code below and you can parse the body as shown in bold text:

using System;
using System.IO;
using System.Text;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Primitives;

namespace webhook_server
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment()) app.UseDeveloperExceptionPage();

            app.Run( async (context) =>
            {
                context.Request.Headers.TryGetValue("Validation-Token", out StringValues validationToken);
                context.Response.Headers.Add("Validation-Token", validationToken);
                if (context.Request.Path == "/webhook" && context.Request.Method == "POST")
                {
                    using (StreamReader reader = new StreamReader(context.Request.Body, Encoding.UTF8))
                    {
                        var str = reader.ReadToEnd();
                        Console.WriteLine(str);
                    }
                }
            });
        }
    }
}