Opayo API - 无法验证签名

Question

我一直在尝试连接到 Opayo 'Reporting & Admin API' 并使用命令 'getTransactionDetail' (https://developer-eu.elavon.com/docs/opayo-reporting-api/reporting-commands/gettransactiondetail)，但不断返回错误 0010，这表明 API 无法验证签名值。我们已经能够使用我们的供应商/用户名/密码组合登录，验证它们都是正确的。

我们在向 API 发送 POST 时使用的代码如下 - 出于安全目的屏蔽了某些元素。

using System;
using System.Collections.Specialized;
using System.Security.Cryptography;
using System.Text;
using System.Net;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string signature = "<command>getTransactionDetail</command><vendor>[Vendor]</vendor><user>[User]</user><vendortxcode>[VendorTXCode]</vendortxcode><password>[Password]</password>";

        using (MD5 md5 = MD5.Create())
        {
            byte[] inputBytes = Encoding.Unicode.GetBytes(signature);
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; i++)
            {
                sb.Append(hashBytes[i].ToString("X2"));
            }
            signature = sb.ToString();
        }

        string xmlToPost = "<vspaccess><command>getTransactionDetail</command><vendor>[Vendor]</vendor><user>[User]</user><vendortxcode>[VendorTXCode]</vendortxcode><signature>" + signature + "</signature></vspaccess>";

        using (WebClient client = new WebClient())
        {
            client.BaseAddress = "https://test.sagepay.com";
            client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            client.Encoding = Encoding.UTF8;

            var content = new NameValueCollection()
            {
                { "XML", xmlToPost }
            };

            string response = Encoding.UTF8.GetString(client.UploadValues("/access/access.htm", content));
        }
    }
}

对于解决此问题的任何帮助将不胜感激！

Answer 1

事实证明，由于我们使用表单集成进行初始付款，我们不得不改用以下 API 文档：https://developer-eu.elavon.com/docs/opayo/spec/api-reference

更具体地说，这部分与重复有关：https://developer-eu.elavon.com/docs/opayo/spec/api-reference#operation/createTransaction

注意右侧的代码示例！