diff --git a/app/Http/Controllers/API/v2/CartController.php b/app/Http/Controllers/API/v2/CartController.php
index 43de7b8..7d928cd 100644
--- a/app/Http/Controllers/API/v2/CartController.php
+++ b/app/Http/Controllers/API/v2/CartController.php
@@ -21,6 +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\CityValidationByName;
 use App\Models\Validation\CompanyValidationByName;
 
@@ -117,10 +118,9 @@ class CartController extends Controller
         $matrixUsername = $request->input('matrixUsername') ?? '';
         $cityName = $request->input('cityName') ?? '';
 
-        // check for not valid user
-        $validation = User::validateWithMatrixUsername($matrixUsername);
-        if(array_key_exists('error', $validation))
-            return response()->json($validation);
+        $validator = new UserValidationByMatrixUsername($matrixUsername);
+        if(!$validator->isValid())
+            return response()->json($validator->getMessageMap());
 
         $validator = new CityValidationByName($cityName);
         if(!$validator->isValid())
@@ -161,10 +161,9 @@ class CartController extends Controller
         $matrixUsername = $request->input('matrixUsername') ?? '';
         $companyName = $request->input('companyName') ?? '';
 
-        // check for not valid user
-        $validation = User::validateWithMatrixUsername($matrixUsername);
-        if(array_key_exists('error', $validation))
-            return response()->json($validation);
+        $validator = new UserValidationByMatrixUsername($matrixUsername);
+        if(!$validator->isValid())
+            return response()->json($validator->getMessageMap());
 
         $validator = new CompanyValidationByName($companyName);
         if(!$validator->isValid())
@@ -203,10 +202,9 @@ class CartController extends Controller
         $itemName = $request->input('itemName') ?? '';
         $itemCount = $request->input('itemCount') ?? '';
 
-        // check for not valid user
-        $validation = User::validateWithMatrixUsername($matrixUsername);
-        if(array_key_exists('error', $validation))
-            return response()->json($validation);
+        $validator = new UserValidationByMatrixUsername($matrixUsername);
+        if(!$validator->isValid())
+            return response()->json($validator->getMessageMap());
 
         // check for not valid item
         $validation = Item::validate_with_name($itemName);
diff --git a/app/Models/User.php b/app/Models/User.php
index 24870d6..19a424b 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -8,7 +8,9 @@ use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 
-class User extends Authenticatable
+use App\Models\Validation\ValidationByNameInterface;
+
+class User extends Authenticatable implements ValidationByNameInterface
 {
     use HasApiTokens, HasFactory, Notifiable;
 
@@ -23,24 +25,18 @@ class User extends Authenticatable
         'phone',
     ];
 
-    public static function validateWithMatrixUsername(string $matrixUsername)
-    {
-        $matrixUsername = $matrixUsername ?? '';
 
-        if($matrixUsername == '')
-            return [
-                'error' => 'The username is empty, please, write username!!!'
-            ];
 
-        $user = User::where('matrix_username', $matrixUsername)->first();
 
-        if(!$user)
-            return [
-                'error' => 'A user with the username does not exist!!!'
-            ];
+    public static function isExistByName(string $name): bool
+    {
+        $count = User::where('matrix_username', $name)->count();
+
+        return $count != 0;
+    }
 
-        return [
-            'ok' => 'A user with the username is valid.'
-        ];
+    public static function isNameValid(string $name): bool
+    {
+        return $name != '';
     }
 }
diff --git a/app/Models/Validation/Messages/UserMessagesFactory.php b/app/Models/Validation/Messages/UserMessagesFactory.php
new file mode 100644
index 0000000..95671eb
--- /dev/null
+++ b/app/Models/Validation/Messages/UserMessagesFactory.php
@@ -0,0 +1,20 @@
+<?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
new file mode 100644
index 0000000..dc7a640
--- /dev/null
+++ b/app/Models/Validation/UserValidationByMatrixUsername.php
@@ -0,0 +1,18 @@
+<?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/Validation/UserValidationTest.php b/tests/Feature/Validation/UserValidationTest.php
index c1a3179..db7a302 100644
--- a/tests/Feature/Validation/UserValidationTest.php
+++ b/tests/Feature/Validation/UserValidationTest.php
@@ -2,38 +2,44 @@
 
 namespace Tests\Feature;
 
-use Illuminate\Foundation\Testing\RefreshDatabase;
-use Illuminate\Foundation\Testing\WithFaker;
 use Tests\TestCase;
 
-use Illuminate\Http\Request;
-
-use App\Models\User;
+use App\Models\Validation\UserValidationByMatrixUsername;
 
 class UserValidationTest extends TestCase
 {
-    public function testEmptyUsernameWithMatrixUsername(): void
-    {
-        $json = User::validateWithMatrixUsername('');
-
-        $this->assertEquals($json['error'], 'The username is empty, please, write username!!!');
+    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,
+            ]
+        ];
     }
 
-    public function testValidUserWithMatrixUsername(): void
+    /**
+     * @dataProvider dataProvider
+     */
+    public function testCityValidationWithName(string $name, string $key, string $message, bool $isValid): void
     {
-        $matrixUsername = '@test:test.com';
-
-        $json = User::validateWithMatrixUsername($matrixUsername);
-
-        $this->assertEquals($json['ok'], 'A user with the username is valid.');
-    }
-
-    public function testNotExistingUserWithMatrixUsername(): void
-    {
-        $matrixUsername = '@kostia:test.com';
-
-        $json = User::validateWithMatrixUsername($matrixUsername);
+        $validator = new UserValidationByMatrixUsername($name);
+        $json = $validator->getMessageMap();
 
-        $this->assertEquals($json['error'], 'A user with the username does not exist!!!');
+        $this->assertEquals($json[$key], $message);
+        $this->assertEquals($validator->isValid(), $isValid);
     }
 }