back/Contracts/DTOs/UserDTO.cs

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+namespace Contracts.DTO;
+
+public class UserDto
+{
+    public Guid? Id { get; set; }
+    public string? Username { get; set; }
+    public string? Password { get; set; }
+    public decimal? Balance { get; set; }
+}

back/Contracts/Repositories/IUserRepo.cs

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+using Contracts.DTO;
+using Contracts.SearchModels;
+
+namespace Contracts.Repositories;
+
+public interface IUserRepo
+{
+    public Task<UserDto> Get(UserSearch search);
+    public Task<UserDto> Create(UserDto user);
+    public Task<UserDto> Update(UserDto user);
+    public Task<UserDto> Delete(UserSearch search);
+}

back/Contracts/SearchModels/UserSearch.cs

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+namespace Contracts.SearchModels;
+
+public class UserSearch
+{
+    public Guid? Id { get; set; }
+}

back/Contracts/Services/IAuthService.cs

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+using Contracts.DTO;
+using Contracts.ViewModels;
+
+namespace Contracts.Services;
+
+public interface IAuthService
+{
+    public Task<UserViewModel> Login();
+    public Task<UserViewModel> Register(UserDto user);
+    public Task<UserViewModel> UpdateUserData(UserDto user);
+    public Task<UserViewModel> Delete(Guid id);
+}

back/Contracts/ViewModels/UserViewModel.cs

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+namespace Contracts.ViewModels;
+
+public class UserViewModel
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public decimal Balance { get; set; }
+}