exchange/routes/backpack/custom.php

<?php

use Illuminate\Support\Facades\Route;

// --------------------------
// Custom Backpack Routes
// --------------------------
// This route file is loaded automatically by Backpack\Base.
// Routes you generate using Backpack\Generators will be placed here.

Route::group([
    'prefix'     => config('backpack.base.route_prefix', 'admin'),
    'middleware' => array_merge(
        (array) config('backpack.base.web_middleware', 'web'),
        (array) config('backpack.base.middleware_key', 'admin')
    ),
    'namespace'  => 'App\Http\Controllers\Admin',
], function () { // custom admin routes
    Route::crud('category', 'CategoryCrudController');
    Route::crud('trading', 'TradingCrudController');
    Route::crud('news', 'NewsCrudController');
    Route::crud('document', 'DocumentCrudController');
    Route::crud('selected-trading', 'SelectedTradingCrudController');

    Route::crud('tarif', 'TarifCrudController');
    Route::crud('multimedia-category', 'MultimediaCategoryCrudController');
    Route::crud('multimedia', 'MultimediaCrudController');
    Route::crud('contact', 'ContactCrudController');
    Route::crud('video', 'VideoCrudController');
    Route::crud('page', 'PageCrudController');
    Route::crud('document-category', 'DocumentCategoryCrudController');
}); // this should be the absolute last line of this file