diff --git a/FitConnect/Subscriber.cs b/FitConnect/Subscriber.cs
index 7af29b81fd003d09c08758bd5db81890bd3e0602..c0c6a3ae301153d7f0dd4cdf6816f5da4129240f 100644
--- a/FitConnect/Subscriber.cs
+++ b/FitConnect/Subscriber.cs
@@ -234,7 +234,7 @@ public class Subscriber : FitConnectClient,
 
         var result = VerifyCallback(callbackSecret, timestamp, content);
         if (result != authentication)
-            throw new ArgumentException("Request is not authentic");
+            throw new ArgumentException("Verified request does not match authentication");
         return true;
     }
 }
diff --git a/IntegrationTests/CallbackTest.cs b/IntegrationTests/CallbackTest.cs
index 989441d6c5098ed8879d6e95801a46548ac31537..827eaebb9ec9f45cf127bcda279751fc553c5e5c 100644
--- a/IntegrationTests/CallbackTest.cs
+++ b/IntegrationTests/CallbackTest.cs
@@ -17,7 +17,7 @@ namespace IntegrationTests;
 
 [TestFixture]
 public class CallbackTest {
-    private HttpRequest Request;
+    private HttpRequest _request = null!;
     private string _callbackSecret = "";
 
     [SetUp]
@@ -30,10 +30,6 @@ public class CallbackTest {
         streamWriter.Flush();
         memoryStream.Position = 0;
 
-        // Request = new DefaultHttpRequest(new DefaultHttpContext()) {
-        //     Body = new StreamBody(memoryStream)
-        // };
-
         var headers = new HeaderDictionary(new Dictionary<string, StringValues>() {
             { "callback-timestamp", "1672527599" }, {
                 "callback-authentication",
@@ -49,7 +45,7 @@ public class CallbackTest {
         mock.Setup(w => w.Method).Returns("POST");
         mock.Setup(w => w.Body).Returns(memoryStream);
 
-        Request = mock.Object;
+        _request = mock.Object;
 
         _callbackSecret = MockContainer.Container.Create().Resolve<MockSettings>().CallbackSecret;
     }
@@ -72,18 +68,18 @@ public class CallbackTest {
     [Test]
     public void ValidRequest() {
         // Assert
-        FitConnect.Subscriber.VerifyCallback(_callbackSecret, Request).Should().Be(true);
+        FitConnect.Subscriber.VerifyCallback(_callbackSecret, _request).Should().Be(true);
     }
 
     [Test]
     public void RequestAge_Fails() {
         // Arrange
-        Request.Headers["callback-timestamp"] = "1641066653";
+        _request.Headers["callback-timestamp"] = "1641066653";
 
         // Atc
         // Assert
         Assert.Throws<ArgumentException>(() => {
-                FitConnect.Subscriber.VerifyCallback(_callbackSecret, Request);
+                FitConnect.Subscriber.VerifyCallback(_callbackSecret, _request);
             })
             .Message.Should().Be("Request is too old");
     }
@@ -91,13 +87,13 @@ public class CallbackTest {
     [Test]
     public void RequestAuthentication_Fails() {
         // Arrange
-        Request.Headers["callback-authentication"] =
+        _request.Headers["callback-authentication"] =
             "898cd0edb70c08e5b32aa8a18cbbc8ff6b3078c51af6d011ff4e32e470c746234fc4314821fe5185264b029e962bd37de33f3b9fc5f1a93c40ce6672845e90df";
 
         // Atc
         // Assert
         Assert.Throws<ArgumentException>(() => {
-                FitConnect.Subscriber.VerifyCallback(_callbackSecret, Request);
+                FitConnect.Subscriber.VerifyCallback(_callbackSecret, _request);
             })
             .Message.Should().Be("Request is not authentic");
     }