diff --git a/Pilz.Net/Api/ApiAuthCheckEventArgs.cs b/Pilz.Net/Api/ApiAuthCheckEventArgs.cs
index 125baeb..53bf914 100644
--- a/Pilz.Net/Api/ApiAuthCheckEventArgs.cs
+++ b/Pilz.Net/Api/ApiAuthCheckEventArgs.cs
@@ -1,9 +1,11 @@
 namespace Pilz.Net.Api;
 
-public class ApiAuthCheckEventArgs(string authKey) : EventArgs
+public class ApiAuthCheckEventArgs(string authKey, Delegate? handler) : EventArgs
 {
     private bool hasDenyed;
 
+    public Delegate? Handler { get; }
+
     public string AuthKey { get; } = authKey;
 
     public bool Valid { get; set; }
diff --git a/Pilz.Net/Api/ApiServer.cs b/Pilz.Net/Api/ApiServer.cs
index ce30082..8888099 100644
--- a/Pilz.Net/Api/ApiServer.cs
+++ b/Pilz.Net/Api/ApiServer.cs
@@ -205,7 +205,7 @@ public class ApiServer(string apiUrl) : IApiServer
         Log.Debug("Check authentication");
         var isAuthenticated = false;
         if (!string.IsNullOrWhiteSpace(authKey) && DecodeAuthKey(authKey) is string authKeyDecoded)
-            isAuthenticated = CheckAuthentication(authKeyDecoded);
+            isAuthenticated = CheckAuthentication(authKeyDecoded, handler);
         else
             authKeyDecoded = null!;
         if (attribute.RequiesAuth && !isAuthenticated)
@@ -278,11 +278,11 @@ public class ApiServer(string apiUrl) : IApiServer
         return Serializer;
     }
 
-    protected virtual bool CheckAuthentication(string authKey)
+    protected virtual bool CheckAuthentication(string authKey, Delegate? handler)
     {
         if (OnCheckAuthentication != null)
         {
-            var args = new ApiAuthCheckEventArgs(authKey);
+            var args = new ApiAuthCheckEventArgs(authKey, handler);
             OnCheckAuthentication?.Invoke(this, args);
             return args.Valid;
         }