Fixed login and logout redirect issue

MidrandBookshop/Components/Pages/Checkout.razor.cs

@@ -126,8 +126,8 @@ public partial class Checkout()
 
             var addItemsResult = await OrderService.AddItemsToOrderAsync(order.Value, [.. orderItems]);
 
-            // 4. Generate the signed Payfast form payload using your backend service
-            var hostAddress = "https://localhost:7021";
+            // 4. Generate the signed Payfast form payload using your backend service            
+            var hostAddress = Navigation.BaseUri.TrimEnd('/');
 
             CheckoutPayload = new Dictionary<string, string>
             {

MidrandBookshop/Components/RedirectToLogin.razor.cs

@@ -4,8 +4,9 @@ public partial class RedirectToLogin
 {
     protected override void OnInitialized()
     {
-        var returnUrl = Navigation.ToBaseRelativePath(Navigation.Uri);
+        var relativePath = Navigation.ToBaseRelativePath(Navigation.Uri);
+        var sanitizedRedirectPath = relativePath.StartsWith('/') ? relativePath : $"/{relativePath}";
 
-        Navigation.NavigateTo($"/login?returnUrl={Uri.EscapeDataString(returnUrl)}", forceLoad: true);
+        Navigation.NavigateTo($"/login?redirectUri={Uri.EscapeDataString(sanitizedRedirectPath)}", forceLoad: true);
     }
 }