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

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

app/Http/Requests/Api/Order/StoreOrderRequest.php

@@ -5,7 +5,7 @@ namespace App\Http\Requests\Api\Order;
 use Illuminate\Foundation\Http\FormRequest;
 
 use Illuminate\Validation\Rule;
-use App\Enums\Product\ProductBillingCycle;
+use App\Support\BillingCycleCatalog;
 use App\Enums\Product\ProductTypeEnums;
 use App\Models\Product;
 
@@ -35,11 +35,12 @@ class StoreOrderRequest extends FormRequest
     {
         return [
             'product_id' => ['required', Rule::exists('products', 'uuid')->whereNull('deleted_at')],
-            'billing_cycle'=> ['required', Rule::enum(ProductBillingCycle::class)],
+            'billing_cycle'=> ['required', Rule::in([...BillingCycleCatalog::codes(), 'onetime'])],
             'server_name'  => $this->isHostingOrder()
                 ? ['required', 'string', 'max:253', 'regex:'.self::DOMAIN_PATTERN]
                 : 'nullable|string|max:255',
             'os_id'        => 'nullable|integer',
+            'coupon_code'  => 'nullable|string|max:50',
             'addons'       => 'array',
             'addons.*.addon_id' => 'nullable|exists:product_addon,id',
             'addons.*.qty' => 'nullable|integer|min:0|max:1000000',