Initial

TaxCalculator/Models/ApiSettings.cs

@@ -0,0 +1,15 @@
+namespace TaxCalculator.Models
+{
+    public class ApiSettings
+    {
+        public string ApiUrl { get; set; }
+
+        public string AppOrigin { get; set; }
+
+        public ApiSettings()
+        {
+            ApiUrl = string.Empty; // or any other default value
+            AppOrigin = string.Empty;
+        }
+    }
+}

TaxCalculator/Models/ErrorViewModel.cs

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+namespace TaxCalculator.Models
+{
+    public class ErrorViewModel
+    {
+        public string? RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}