feat(billing): renewals, coupons, VAT numbering, billing cycles and invoice payment tracking

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Mail/Customer/DomainOrderReceivedNotification.php

@@ -3,8 +3,10 @@
 namespace App\Mail\Customer;
 
 use App\Mail\TemplateMailable;
+use App\Services\InvoicePdfService;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailables\Attachment;
 use Illuminate\Queue\SerializesModels;
 
 class DomainOrderReceivedNotification extends TemplateMailable implements ShouldQueue
@@ -15,6 +17,15 @@ class DomainOrderReceivedNotification extends TemplateMailable implements Should
         protected array $data,
     ) {}
 
+    public function attachments(): array
+    {
+        $invoice = app(InvoicePdfService::class)->attachment($this->data['invoice_id'] ?? null);
+
+        return $invoice
+            ? [Attachment::fromData(fn () => $invoice['pdf'], $invoice['file_name'])->withMime('application/pdf')]
+            : [];
+    }
+
     protected function scenario(): string
     {
         return 'domain_order_received';