Add all files

app/Classes/PDF.php

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+<?php
+
+namespace App\Classes;
+
+use App\Models\Invoice;
+use Barryvdh\DomPDF\Facade\Pdf as DomPDF;
+
+class PDF
+{
+    public static function generateInvoice(Invoice $invoice)
+    {
+        $pdf = DomPDF::loadView('pdf.invoice', ['invoice' => $invoice]);
+
+        return $pdf;
+    }
+}