diff --git a/app/Http/Controllers/API/v2/CartController.php b/app/Http/Controllers/API/v2/CartController.php
index 9f97624..d5dc04a 100644
--- a/app/Http/Controllers/API/v2/CartController.php
+++ b/app/Http/Controllers/API/v2/CartController.php
@@ -21,7 +21,7 @@ use App\DotsAPI\Fetcher\v2\AuthApiFetcher;
 use App\DotsAPI\Fetcher\v2\AuthApiSender;
 use App\Http\Resources\API\v2\CartItemCollection;
 
-use App\Models\Validation\UserValidationByMatrixUsername;
+use App\Models\Validation\Validators\Informative\Factories\UserInformativeValidatorByMatrixUserNameFactory;
 use App\Models\Validation\Validators\Informative\Factories\CityInformativeValidatorByNameFactory;
 use App\Models\Validation\Validators\Informative\Factories\CompanyInformativeValidatorByNameFactory;
 use App\Models\Validation\Validators\Informative\Factories\ItemInformativeValidatorByNameFactory;
@@ -119,13 +119,15 @@ class CartController extends Controller
         $matrixUsername = $request->input('matrixUsername') ?? '';
         $cityName = $request->input('cityName') ?? '';
 
-        $validator = new UserValidationByMatrixUsername($matrixUsername);
-        if(!$validator->isValid())
-            return response()->json($validator->getMessageMap());
+        $validators = [
+            (new UserInformativeValidatorByMatrixUserNameFactory($matrixUsername))->create(),
+            (new CityInformativeValidatorByNameFactory($cityName))->create()
+        ];
 
-        $validator = (new CityInformativeValidatorByNameFactory($cityName))->create();
-        if(!$validator->isValid())
-            return response()->json($validator->getOkStatus());
+        foreach($validators as $validator) {
+            if(!$validator->isValid())
+                return response()->json($validator->getOkStatus());
+        }
 
         // Get objects
         $user = User::where('matrix_username', $matrixUsername)->first();
@@ -162,13 +164,15 @@ class CartController extends Controller
         $matrixUsername = $request->input('matrixUsername') ?? '';
         $companyName = $request->input('companyName') ?? '';
 
-        $validator = new UserValidationByMatrixUsername($matrixUsername);
-        if(!$validator->isValid())
-            return response()->json($validator->getMessageMap());
+        $validators = [
+            (new UserInformativeValidatorByMatrixUserNameFactory($matrixUsername))->create(),
+            (new CompanyInformativeValidatorByNameFactory($companyName))->create()
+        ];
 
-        $validator = (new CompanyInformativeValidatorByNameFactory($companyName))->create();
-        if(!$validator->isValid())
-            return response()->json($validator->getOkStatus());
+        foreach($validators as $validator) {
+            if(!$validator->isValid())
+                return response()->json($validator->getOkStatus());
+        }
 
         // Get objects
         $user = User::where('matrix_username', $matrixUsername)->first();
@@ -203,13 +207,15 @@ class CartController extends Controller
         $itemName = $request->input('itemName') ?? '';
         $itemCount = $request->input('itemCount') ?? '';
 
-        $validator = new UserValidationByMatrixUsername($matrixUsername);
-        if(!$validator->isValid())
-            return response()->json($validator->getMessageMap());
+        $validators = [
+            (new UserInformativeValidatorByMatrixUserNameFactory($matrixUsername))->create(),
+            (new ItemInformativeValidatorByNameFactory($itemName))->create()
+        ];
 
-        $validator = (new ItemInformativeValidatorByNameFactory($itemName))->create();
-        if(!$validator->isValid())
-            return response()->json($validator->getOkStatus());
+        foreach($validators as $validator) {
+            if(!$validator->isValid())
+                return response()->json($validator->getOkStatus());
+        }
 
         if($itemCount == 0)
             return response()->json([
diff --git a/app/Models/User.php b/app/Models/User.php
index f8c3d8a..59fe1a5 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -9,9 +9,7 @@ use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
-use App\Models\Validation\ValidationByNameInterface;
-
-class User extends Authenticatable implements ValidationByNameInterface
+class User extends Authenticatable
 {
     use HasApiTokens, HasFactory, Notifiable;
 
@@ -29,18 +27,6 @@ class User extends Authenticatable implements ValidationByNameInterface
 
 
 
-    public static function isExistByName(string $name): bool
-    {
-        $count = User::where('matrix_username', $name)->count();
-
-        return $count != 0;
-    }
-
-    public static function isNameValid(string $name): bool
-    {
-        return $name != '';
-    }
-
     public function userAddresses(): HasMany
     {
         return $this->hasMany(UserAddress::class);
diff --git a/app/Models/Validation/Messages/UserMessagesFactory.php b/app/Models/Validation/Messages/UserMessagesFactory.php
deleted file mode 100644
index 95671eb..0000000
--- a/app/Models/Validation/Messages/UserMessagesFactory.php
+++ /dev/null
@@ -1,20 +0,0 @@
-<?php
-
-namespace App\Models\Validation\Messages;
-
-use App\Models\Validation\Messages\BaseMessages;
-
-class UserMessagesFactory
-{
-    protected array $messages = [
-        'found' => 'A user with the username is valid.',
-        'not_found' => 'A user with the username does not exist!!!',
-        'invalid_name' => 'The username is empty, please, write username!!!',
-    ];
-
-    public function create()
-    {
-        return new BaseMessages($this->messages);
-    }
-}
-
diff --git a/app/Models/Validation/UserValidationByMatrixUsername.php b/app/Models/Validation/UserValidationByMatrixUsername.php
deleted file mode 100644
index dc7a640..0000000
--- a/app/Models/Validation/UserValidationByMatrixUsername.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-namespace App\Models\Validation;
-
-use App\Models\Validation\ModelValidationByName;
-use App\Models\Validation\Messages\UserMessagesFactory;
-
-class UserValidationByMatrixUsername extends ModelValidationByName
-{
-    public function __construct(string $name)
-    {
-        parent::__construct(
-            $name,
-            'App\Models\User',
-            (new UserMessagesFactory())->create(),
-        );
-    }
-}
diff --git a/tests/Feature/CartTest.php b/tests/Feature/CartTest.php
index 66d5321..d7caab7 100644
--- a/tests/Feature/CartTest.php
+++ b/tests/Feature/CartTest.php
@@ -303,7 +303,7 @@ class CartTest extends TestCase
         $response->assertStatus(200);
 
         $response->assertJson([
-            'error' => 'The username is empty, please, write username!!!'
+            'error' => 'The username is invalid, please, check that you are registered or signed in!!!'
         ]);
     }
 
@@ -321,7 +321,7 @@ class CartTest extends TestCase
         $response->assertStatus(200);
 
         $response->assertJson([
-            'error' => 'The username is empty, please, write username!!!'
+            'error' => 'The username is invalid, please, check that you are registered or signed in!!!'
         ]);
     }
 }
diff --git a/tests/Feature/Validation/UserValidationTest.php b/tests/Feature/Validation/UserValidationTest.php
deleted file mode 100644
index 5cc7931..0000000
--- a/tests/Feature/Validation/UserValidationTest.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-namespace Tests\Feature;
-
-use Tests\TestCase;
-
-use App\Models\Validation\UserValidationByMatrixUsername;
-
-class UserValidationTest extends TestCase
-{
-    public function dataProvider() {
-        return [
-            'Invalid Case' => [
-                'name' => '',
-                'key' => 'error',
-                'message' =>  'The username is empty, please, write username!!!',
-                'isValid' =>  false,
-            ],
-            'Not Found Case' => [
-                'name' => '@kostia:test.com',
-                'key' => 'error',
-                'message' =>  'A user with the username does not exist!!!',
-                'isValid' =>  false,
-            ],
-            'Found Case' => [
-                'name' => '@test:test.com',
-                'key' => 'ok',
-                'message' =>  'A user with the username is valid.',
-                'isValid' =>  true,
-            ]
-        ];
-    }
-
-    /**
-     * @dataProvider dataProvider
-     */
-    public function testUserValidationWithName(string $name, string $key, string $message, bool $isValid): void
-    {
-        $validator = new UserValidationByMatrixUsername($name);
-        $json = $validator->getMessageMap();
-
-        $this->assertEquals($json[$key], $message);
-        $this->assertEquals($validator->isValid(), $isValid);
-    }
-}