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

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

app/Services/OrderService.php

@@ -29,6 +29,7 @@ use Carbon\Carbon;
 use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Str;
+use App\Support\VatNumbering;
 
 class OrderService
 {
@@ -205,6 +206,7 @@ class OrderService
                 'total_price' => $item['price'] * $item['quantity'],
             ], $productItems);
             $this->invoiceItemRepository->insert($invoiceItemData);
+            VatNumbering::settle($invoice);
 
             $now = now();
             OrderItem::insert(array_map(fn ($item) => [