try

Webshop.Application/Services/Admin/IAdminUserService.cs

@@ -0,0 +1,15 @@
+// src/Webshop.Application/Services/Admin/IAdminUserService.cs
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Webshop.Application.DTOs.Users; // UserDto
+
+namespace Webshop.Application.Services.Admin
+{
+    public interface IAdminUserService
+    {
+        Task<IEnumerable<UserDto>> GetAllUsersAsync();
+        Task<UserDto?> GetUserByIdAsync(string userId);
+        // Task<bool> UpdateUserRolesAsync(string userId, List<string> newRoles); // Beispiel für zukünftige Methode
+        // Task<bool> DeleteUserAsync(string userId); // Beispiel für zukünftige Methode
+    }
+}