voucher/app/Http/Middleware/CustomerApi.php

<?php

namespace App\Http\Middleware;

use App\Models\Customer;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Symfony\Component\HttpFoundation\Response;

class CustomerApi
{
    /**
     * Handle an incoming request.
     *
     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
     */
    public function handle(Request $request, Closure $next): Response
    {
        if ($request->header('user') != '') {
            $customer = Customer::find($request->header('user'));
            Auth::guard('customer')->setUser($customer);
        }
        return $next($request);
    }
}