update email template

app/Integrations/Whmcs/DTOs/InvoiceItemData.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Integrations\Whmcs\DTOs;
+
+class InvoiceItemData
+{
+    public function __construct(
+        public readonly int $legacyId,
+        public readonly string $type,
+        public readonly ?string $description,
+        public readonly int $unitPrice,
+        public readonly int $totalPrice,
+        public readonly ?int $productId = null,
+    ) {
+    }
+}