WooCommerce Webhook C＃-比较哈希

有人可以告诉我如何从WooCommerce Webhook重新创建哈希以与请求中的“ X-WC-Webhook-Signature”标头哈希进行比较吗？

该文档指定哈希是从“有效载荷”生成的，但是我无法生成相同的哈希。

我的API是.NET Core 3.1

我尝试过的第一件事：

var secret = "XXX";
var requestHash = Request.Headers["X-WC-Webhook-Signature"];
var generatedHash = "";
Stream byteContent = Request.Body;
byte[] keyByte = encoding.GetBytes(secret);
using(var hmacsha256 = new HMACSHA256(keyByte))
{
     byte[] hashmessage = hmacsha256.ComputeHash(byteContent);
     generatedHash = Convert.ToBase64String(hashmessage);
 }
 if(requestHash == generatedHash)
 {
     // Succes
 }

第二：

using(StreamReader reader = new StreamReader(Request.Body, Encoding.UTF8))
{
    String json = await reader.ReadToEndAsync();
    var generatedHash = "";
    byte[] messageBytes = encoding.GetBytes(json);
    keyByte = encoding.GetBytes(secret);
    using(var hmacsha256 = new HMACSHA256(keyByte))
    {
        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
        generatedHash = Convert.ToBase64String(hashmessage);
    }

    if(requestHash == generatedHash)
    {
        // Succes
    }
}