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Credentials/MissingCredentialsException.cs

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+namespace Csob.Credentials;
+
+/// <summary>
+/// Raised when a request does not provide the credential headers required to call ČSOB.
+/// Translated to HTTP 401 by the exception-handling middleware.
+/// </summary>
+public sealed class MissingCredentialsException : Exception
+{
+    public IReadOnlyList<string> MissingHeaders { get; }
+
+    public MissingCredentialsException(IReadOnlyList<string> missingHeaders)
+        : base("Incomplete ČSOB credentials. Provide the missing values as request headers (TLS only).")
+    {
+        MissingHeaders = missingHeaders;
+    }
+}