refactor(openai): 重新实现请求加密 XML 序列化的方式

test/SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests/TestCase_ApiExecuteMpTests.cs

@@ -0,0 +1,17 @@
+using System.Threading.Tasks;
+using Xunit;
+
+namespace SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests
+{
+    public class TestCase_ApiExecuteMpTests
+    {
+        [Fact(DisplayName = "测试用例：调用 API [POST] /getbindlink/{TOKEN}")]
+        public async Task TestExecuteSign()
+        {
+            var request = new Models.GetBindLinkRequest() { RedirectUrl = "https://example.com" };
+            var response = await TestClients.Instance.ExecuteGetBindLinkAsync(request);
+
+            Assert.NotNull(response.LinkUrl);
+        }
+    }
+}