boursecu_server/app/Services/ConfigService.php

<?php

namespace App\Services;

use App\Models\Setting;

class ConfigService
{
    public function Config($name)
    {
        return Setting::where('key', $name)->value('value') ?? false;
    }

    public function UpdateConfig($name, $value)
    {
        return \App\Models\Setting::updateOrCreate(
            ['key' => $name],
            ['value' => $value]
        );
    }
}