stagfe2/app/Http/Controllers/TicketController.php

<?php

namespace App\Http\Controllers;

use App\Models\Ticket;
use Illuminate\Http\Request;

use PDF;

class TicketController extends Controller
{
    
    public function downloadAsPdf(Request $request, Ticket $ticket){
        $pdf = PDF::loadView('app.ticket.pdf-preview', compact('ticket'));
        return $pdf->download('invoice.pdf');
    }
}