Refactor.

PSManagement.Application/Abstraction/Messaging/ICommand.cs

-using MediatR;
-
-namespace PSManagement.Application.Abstraction.Messaging
-{
-    public interface ICommand<out TResponse> : IRequest<TResponse>
-    {
-    }
-}

PSManagement.Application/Abstraction/Messaging/ICommandHandler.cs

-using MediatR;
-
-namespace PSManagement.Application.Abstraction.Messaging
-{
-    public interface ICommandHandler<in TCommand, TResponse> : IRequestHandler<TCommand, TResponse>
-                         where TCommand : ICommand<TResponse>
-    {
-    }
-}

PSManagement.Application/Abstraction/Messaging/IQuery.cs

-using MediatR;
-
-namespace PSManagement.Application.Abstraction.Messaging
-{
-    public interface IQuery<out TResponse> : IRequest<TResponse>
-    {
-    }
-}

PSManagement.Application/Abstraction/Messaging/IQueryHandler.cs

-using MediatR;
-
-namespace PSManagement.Application.Abstraction.Messaging
-{
-    public interface IQueryHandler<in TQuery, TResponse> : IRequestHandler<TQuery, TResponse>
-    where TQuery : IQuery<TResponse>
-    {
-    }
-}

PSManagement.Application/Behaviors/ValidationBehavior/ValidationBehavior.cs

 using MediatR;
-using PSManagement.Application.Abstraction.Messaging;
 using PSManagement.Application.Common.Exceptions;
 using System;
 using System.Collections.Generic;

PSManagement.Application/Contracts/Authentication/AuthenticationResult.cs

@@ -8,7 +8,7 @@ namespace PSManagement.Application.Contracts.Authentication
 {
     public class AuthenticationResult
     {
-        public Guid Id { get; set; }
+        public int Id { get; set; }
         public String Email { get; set; }
         public String LastName { get; set; }
         public String FirstName { get; set; }

PSManagement.Application/Contracts/Authentication/IAuthenticationService.cs

-using System;
+using PSManagement.SharedKernel.Utilities;
+using System;
 using System.Threading.Tasks;
 
 namespace PSManagement.Application.Contracts.Authentication
 {
     public interface IAuthenticationService
     {
-        public Task<AuthenticationResult> Login(String email , String password);
-        public Task<AuthenticationResult> Register(String email,String firstName ,String lastName, String password);
+        public Task<Result<AuthenticationResult>> Login(String email , String password);
+        public Task<Result<AuthenticationResult>> Register(String email,String firstName ,String lastName, String password);
 
 
     }

PSManagement.Application/Contracts/Authentication/IUsersRepository.cs

+using PSManagement.SharedKernel.Repositories;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PSManagement.Application.Contracts.Authentication
+{
+    public interface IUsersRepository : IRepository<User>
+    {
+        public Task<User> GetByEmail(String email);
+    }
+}

PSManagement.Application/Contracts/Authentication/User.cs

+using PSManagement.SharedKernel.Entities;
+using System;
+
+namespace PSManagement.Application.Contracts.Authentication
+{
+    public class User :BaseEntity
+    {
+        public String Email { get; set; }
+        public String LastName { get; set; }
+        public String FirstName { get; set; }
+        public String Password { get; set; }
+        public String Token { get; set; }
+
+    }
+}
\ No newline at end of file

PSManagement.Application/Contracts/Authentication/IJwtTokenGenerator.cs → PSManagement.Application/Contracts/Authorization/IJwtTokenGenerator.cs

 using System;
 
-namespace PSManagement.Application.Contracts.Authentication
+namespace PSManagement.Application.Contracts.Authorization
 {
     public interface IJwtTokenGenerator
     {
-        public String GenerateToken(Guid id , String firstName , String lastName,String email );
+        public String GenerateToken(int id , String firstName , String lastName,String email );
     }
 }

PSManagement.Application/Contracts/Email/IEmailService.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PSManagement.Application.Contracts.Email
+{
+    public interface IEmailService
+    {
+        Task SendAsync(String  recipient, String subject, String body);
+
+    }
+}

PSManagement.Application/PSManagement.Application.csproj

@@ -5,6 +5,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Folder Include="Abstraction\" />
+    <Folder Include="Behaviors\AuthorizationBehavior\" />
     <Folder Include="Services\" />
     <Folder Include="UseCases\" />
   </ItemGroup>

PSManagement.Contracts/Authentication/AuthenticationResponse.cs

@@ -7,7 +7,7 @@ using System.Threading.Tasks;
 namespace PSManagement.Contracts.Authentication
 {
     public record AuthenticationResponse(
-        Guid Id ,
+        int Id ,
         String FirstName,
         String LastName ,
         String Email ,