try

Webshop.Application/DTOs/CustomerDto.cs

@@ -0,0 +1,20 @@
+// Auto-generiert von CreateWebshopFiles.ps1
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+
+namespace Webshop.Application.DTOs
+{
+    public class CustomerDto
+    {
+        public Guid Id { get; set; }
+        public string UserId { get; set; } = string.Empty;
+        public string FirstName { get; set; } = string.Empty;
+        public string LastName { get; set; } = string.Empty;
+        public string Email { get; set; } = string.Empty;
+        public string? PhoneNumber { get; set; }
+        public Guid? DefaultShippingAddressId { get; set; }
+        public Guid? DefaultBillingAddressId { get; set; }
+    }
+}