Webhook Security

using System;
using System.Security.Cryptography;
using System.Text;
					
public class Program
{
	private static byte[] ComputeSHA512Hash(string data)
	{
		byte[] hash;
		using (SHA512 shaM = SHA512.Create())
			{
			   var b = Encoding.UTF8.GetBytes(data);
			   hash = shaM.ComputeHash(b);
			}
		return hash;
	}
	
	private static bool check(string serverSignature, dynamic data){
		var clientSecret = "THIS IS A SECRET";
		var stringToHash = $"{data.eventTime}.{data.eventId}.{clientSecret}";
		var hmacResult = ComputeSHA512Hash(stringToHash);
		var clientSignature = Convert.ToHexString(hmacResult);
	
		return clientSignature == serverSignature;
	}
	
	public static void Main()
	{
		var requestBody = @"{
  ""eventType"": ""change"",
  ""eventTime"": ""2023-06-14 13:56:12"",
  ""eventId"": ""1A2AE4F6-60EE-49BC-B1E5-BCCD4D77EA6D"",
  ""source"": ""table"",
  ""sourceObject"": ""Extension_Factors""
}";
		dynamic body = Newtonsoft.Json.JsonConvert.DeserializeObject(requestBody);
		if (
		check("3A003D142EB816099406B89D41DAA6F060885320BB9D4C8288CE46F7A78DB859A99AD34766A23476C3AB81A680997811D7FF2F15AF37DD971FEB389F063B938E", //this is what you need to check //Take from request header "X-Priceedge-Webhook-Signature"
			  body))
			Console.WriteLine("Good signature");
		else
			Console.WriteLine("Bad signature");
	}
}