diff --git a/backend/app/Models/Gateway.php b/backend/app/Models/Gateway.php
new file mode 100644
index 00000000..d7b58f9c
--- /dev/null
+++ b/backend/app/Models/Gateway.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\GatewayFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Gateway extends Model
+{
+    /** @use HasFactory<GatewayFactory> */
+    use HasFactory;
+
+    protected $guarded = ['id'];
+}
diff --git a/backend/app/Models/GatewayCategory.php b/backend/app/Models/GatewayCategory.php
new file mode 100644
index 00000000..dd1e29df
--- /dev/null
+++ b/backend/app/Models/GatewayCategory.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\GatewayCategoryFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class GatewayCategory extends Model
+{
+    /** @use HasFactory<GatewayCategoryFactory> */
+    use HasFactory;
+
+    protected $guarded = ['id'];
+}
diff --git a/backend/app/Models/Payment.php b/backend/app/Models/Payment.php
new file mode 100644
index 00000000..f4d1f85a
--- /dev/null
+++ b/backend/app/Models/Payment.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\PaymentFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Payment extends Model
+{
+    /** @use HasFactory<PaymentFactory> */
+    use HasFactory;
+
+    protected $guarded = ['id'];
+}
diff --git a/backend/app/Models/PaymentStatus.php b/backend/app/Models/PaymentStatus.php
new file mode 100644
index 00000000..b173c343
--- /dev/null
+++ b/backend/app/Models/PaymentStatus.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\PaymentStatusFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class PaymentStatus extends Model
+{
+    /** @use HasFactory<PaymentStatusFactory> */
+    use HasFactory;
+
+    protected $guarded = ['id'];
+}
diff --git a/backend/app/User/Controllers/DocumentationController.php b/backend/app/User/Controllers/DocumentationController.php
new file mode 100755
index 00000000..7c6b8092
--- /dev/null
+++ b/backend/app/User/Controllers/DocumentationController.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace App\User\Controllers;
+
+use App\Facades\File\FileFacade;
+use App\Http\Controllers\Controller;
+use App\Traits\ApiResponse;
+use App\User\Requests\Documentation\EditRequest;
+use App\User\Requests\Documentation\UploadRequest;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class DocumentationController extends Controller
+{
+    use ApiResponse;
+
+    public function upload(UploadRequest $request): jsonResponse
+    {
+        $user = Auth::guard('web')->user();
+
+        foreach ($request->documents as $document) {
+            $user->documents()->create([
+                'title' => $document['title'],
+                'url' => FileFacade::save($document['file'], "/{$user->id}/documents", $document['title']),
+            ]);
+        }
+
+        return $this->successResponse();
+    }
+
+    public function edit(EditRequest $request): JsonResponse
+    {
+        $user = Auth::guard('web')->user();
+
+        foreach ($request->documents as $document) {
+            $user->documents()->sync();
+        }
+
+        return $this->successResponse();
+    }
+}
diff --git a/backend/app/User/Requests/Documentation/EditRequest.php b/backend/app/User/Requests/Documentation/EditRequest.php
new file mode 100755
index 00000000..25c3e1d2
--- /dev/null
+++ b/backend/app/User/Requests/Documentation/EditRequest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\User\Requests\Documentation;
+
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+
+class EditRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, ValidationRule|array|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'documents' => 'required|array',
+            'documents.*.file' => 'required|file|mimes:pdf,jpg,jpeg,png|max:2048',
+            'documents.*.title' => 'required|string',
+        ];
+    }
+}
diff --git a/backend/app/User/Requests/Documentation/UploadRequest.php b/backend/app/User/Requests/Documentation/UploadRequest.php
new file mode 100755
index 00000000..b832c916
--- /dev/null
+++ b/backend/app/User/Requests/Documentation/UploadRequest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace App\User\Requests\Documentation;
+
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+
+class UploadRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, ValidationRule|array|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'documents' => 'required|array',
+            'documents.*.file' => 'required|file|mimes:pdf,jpg,jpeg,png|max:2048',
+            'documents.*.title' => 'required|string',
+        ];
+    }
+}
diff --git a/backend/database/factories/GatewayCategoryFactory.php b/backend/database/factories/GatewayCategoryFactory.php
new file mode 100644
index 00000000..facefb5e
--- /dev/null
+++ b/backend/database/factories/GatewayCategoryFactory.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\GatewayCategory;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<GatewayCategory>
+ */
+class GatewayCategoryFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            //
+        ];
+    }
+}
diff --git a/backend/database/factories/GatewayFactory.php b/backend/database/factories/GatewayFactory.php
new file mode 100644
index 00000000..f8029ab5
--- /dev/null
+++ b/backend/database/factories/GatewayFactory.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\Gateway;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Gateway>
+ */
+class GatewayFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            //
+        ];
+    }
+}
diff --git a/backend/database/factories/PaymentFactory.php b/backend/database/factories/PaymentFactory.php
new file mode 100644
index 00000000..8bfd4911
--- /dev/null
+++ b/backend/database/factories/PaymentFactory.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\Payment;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Payment>
+ */
+class PaymentFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            //
+        ];
+    }
+}
diff --git a/backend/database/factories/PaymentStatusFactory.php b/backend/database/factories/PaymentStatusFactory.php
new file mode 100644
index 00000000..390010db
--- /dev/null
+++ b/backend/database/factories/PaymentStatusFactory.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\PaymentStatus;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<PaymentStatus>
+ */
+class PaymentStatusFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            //
+        ];
+    }
+}
diff --git a/backend/database/migrations/2026_05_17_053830_create_payment_statuses_table.php b/backend/database/migrations/2026_05_17_053830_create_payment_statuses_table.php
new file mode 100644
index 00000000..754a8790
--- /dev/null
+++ b/backend/database/migrations/2026_05_17_053830_create_payment_statuses_table.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('payment_statuses', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('payment_statuses');
+    }
+};
diff --git a/backend/database/migrations/2026_05_17_053831_create_gateway_categories_table.php b/backend/database/migrations/2026_05_17_053831_create_gateway_categories_table.php
new file mode 100644
index 00000000..16ee53ea
--- /dev/null
+++ b/backend/database/migrations/2026_05_17_053831_create_gateway_categories_table.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('gateway_categories', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('gateway_categories');
+    }
+};
diff --git a/backend/database/migrations/2026_05_17_053832_create_gateways_table.php b/backend/database/migrations/2026_05_17_053832_create_gateways_table.php
new file mode 100644
index 00000000..faab5d50
--- /dev/null
+++ b/backend/database/migrations/2026_05_17_053832_create_gateways_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('gateways', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained('users');
+            $table->string('username');
+            $table->string('name');
+            $table->string('domain');
+            $table->string('tax_id');
+            $table->string('bank_name');
+            $table->string('account_holder');
+            $table->string('logo')->nullable();
+            $table->string('iban');
+            $table->foreignId('category_id')->constrained('gateway_categories');
+            $table->string('category_name');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('gateways');
+    }
+};
diff --git a/backend/database/migrations/2026_05_17_053833_create_payments_table.php b/backend/database/migrations/2026_05_17_053833_create_payments_table.php
new file mode 100644
index 00000000..0bf5cc2e
--- /dev/null
+++ b/backend/database/migrations/2026_05_17_053833_create_payments_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('payments', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained('users');
+            $table->string('username');
+            $table->uuid('track_id');
+            $table->string('amount');
+            $table->string('currency');
+            $table->string('callback_url');
+            $table->dateTime('expires_at');
+            $table->foreignId('status_id')->constrained('payment_statuses');
+            $table->string('status_name');
+            $table->ipAddress('ip');
+            $table->foreignId('gateway_id')->constrained('gateways');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('payments');
+    }
+};
diff --git a/backend/database/seeders/GatewayCategorySeeder.php b/backend/database/seeders/GatewayCategorySeeder.php
new file mode 100644
index 00000000..6e41f3b8
--- /dev/null
+++ b/backend/database/seeders/GatewayCategorySeeder.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+
+class GatewayCategorySeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        //
+    }
+}
diff --git a/backend/database/seeders/GatewaySeeder.php b/backend/database/seeders/GatewaySeeder.php
new file mode 100644
index 00000000..1d778374
--- /dev/null
+++ b/backend/database/seeders/GatewaySeeder.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+
+class GatewaySeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        //
+    }
+}
diff --git a/backend/database/seeders/PaymentSeeder.php b/backend/database/seeders/PaymentSeeder.php
new file mode 100644
index 00000000..dd108b7b
--- /dev/null
+++ b/backend/database/seeders/PaymentSeeder.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+
+class PaymentSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        //
+    }
+}
diff --git a/backend/database/seeders/PaymentStatusSeeder.php b/backend/database/seeders/PaymentStatusSeeder.php
new file mode 100644
index 00000000..5550baae
--- /dev/null
+++ b/backend/database/seeders/PaymentStatusSeeder.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+
+class PaymentStatusSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        //
+    }
+}
diff --git a/backend/routes/expert.php b/backend/routes/expert.php
index 12c3e98a..14f37a0c 100755
--- a/backend/routes/expert.php
+++ b/backend/routes/expert.php
@@ -2,6 +2,10 @@
 
 use App\Admin\Controllers\AuthController;
 use App\Admin\Controllers\DocumentationController;
+use App\Admin\Controllers\ExpertManagementController;
+use App\Admin\Controllers\PermissionManagementController;
+use App\Admin\Controllers\RoleManagementController;
+use App\Admin\Controllers\UserManagementController;
 use App\Admin\Controllers\ProfileController;
 
 Route::prefix('auth')
@@ -19,11 +23,56 @@ Route::prefix('documents')
     ->controller(DocumentationController::class)
     ->group(function () {
         Route::get('/', 'index')->name('index');
-        Route::post('confirm', 'confirm')->name('confirm');
-        Route::post('reject', 'reject')->name('reject');
+        Route::post('confirm/{user}', 'confirm')->name('confirm');
+        Route::post('reject/{user}', 'reject')->name('reject');
         Route::get('files/{user}', 'files')->name('files');
     });
 
+Route::prefix('user_management')
+    ->middleware(['auth:expert', 'permission:user-management'])
+    ->name('user_management.')
+    ->controller(UserManagementController::class)
+    ->group(function () {
+        Route::get('/', 'index')->name('index');
+        Route::post('/', 'store')->name('store');
+        Route::get('/{user}', 'show')->name('show');
+        Route::post('/{user}', 'update')->name('update');
+        Route::delete('/{user}', 'destroy')->name('destroy');
+    });
+Route::prefix('roles')
+    ->name('roles.')
+    ->middleware(['auth:expert', 'permission:role-management'])
+    ->controller(RoleManagementController::class)
+    ->group(function () {
+        Route::get('/', 'index')->name('index');
+        Route::post('/', 'store')->name('store');
+        Route::get('/{role}', 'show')->name('show');
+        Route::post('/{role}', 'update')->name('update');
+        Route::delete('/{role}', 'destroy')->name('destroy');
+    });
+Route::prefix('permissions')
+    ->name('permissions.')
+    ->middleware(['auth:expert', 'permission:permission-management'])
+    ->controller(PermissionManagementController::class)
+    ->group(function () {
+        Route::get('/', 'index')->name('index');
+        Route::post('/', 'store')->name('store');
+        Route::get('/{permission}', 'show')->name('show');
+        Route::post('/{permission}', 'update')->name('update');
+        Route::delete('/{permission}', 'destroy')->name('destroy');
+    });
+Route::prefix('expert')
+    ->name('expert.')
+    ->middleware(['auth:expert', 'permission:expert-management'])
+    ->controller(ExpertManagementController::class)
+    ->group(function () {
+        Route::get('/', 'index')->name('index');
+        Route::post('/', 'store')->name('store');
+        Route::get('/{expert}', 'show')->name('show');
+        Route::post('/{expert}', 'update')->name('update');
+        Route::delete('/{expert}', 'destroy')->name('destroy');
+    });
+
 Route::prefix('profile')
     ->name('profile.')
     ->middleware('auth')