portal/routes/segment.php

<?php

use Illuminate\Support\Facades\Route;

Route::group(['prefix' => 'segment', 'as' => 'segment.', 'namespace' => 'Segments'], function () {
    Route::get('/{id}/show', 'FetchSegmentController@fetch')->name('show');
    Route::post('/create', 'CreateSegmentController@create')->name('create');
    Route::put('/update/{id}', 'UpdateSegmentController@update')->name('update');
    Route::delete('/delete/{id}', 'DeleteSegmentController@delete')->name('delete');
    Route::get('/list', 'ListSegmentsController@list')->name('list');

    Route::group(['prefix' => '{id}/constant', 'as' => 'constant.'], function () {
        Route::put('/service/update', 'UpdateCustomServiceConstantController@update')->name('service.update');
        Route::put('/update', 'UpdateConstantController@update')->name('update');
        Route::get('/show/{reference}', 'FetchConstantController@fetch')->name('show');
    });
});