向 Swish API 发送有效负载时出现签名问题

Question

我正在尝试使用TLS和签名证书将有效载荷发送到Swish（瑞典支付系统）。我目前正在与商人使用模拟器，并使用测试认证来自Swish文档。

在发送有效载荷和签名时（到EndPont /api/v1/payouts ）我会得到此错误：

{StatusCode: 401, ReasonPhrase: 'Unauthorized', Version: 1.1, Content: System.Net.Http.HttpConnectionResponseContent, Headers:
{
  Date: Tue, 12 Apr 2022 07:02:19 GMT
  Server: openresty/1.15.8.3
  Vary: Origin
  Vary: Access-Control-Request-Method
  Vary: Access-Control-Request-Headers
  Transfer-Encoding: chunked
  Content-Type: application/json
}}

下面的代码用于生成

var payloadJson = JsonConvert.SerializeObject(payload, Formatting.None, serializerSettings);
var payloadJsonBuffer = Encoding.UTF8.GetBytes(payloadJson);
using var sha512 = SHA512.Create();
var hashedBuffer = sha512.ComputeHash(payloadJsonBuffer);
using var rsa = signCert.GetRSAPrivateKey();
var signedBuffer = rsa.SignHash(hashedBuffer, HashAlgorithmName.SHA512, RSASignaturePadding.Pkcs1);
var signature = Convert.ToBase64String(signedBuffer, Base64FormattingOptions.None);
var requestBody = new SwishPayoutRequestBody
{
    Payload = payload,
    Signature = signature
};

签名使用C＃与SWISH API合作的经验吗？

谢谢！