update email template

app/Integrations/Whmcs/Support/ProductIdResolver.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Integrations\Whmcs\Support;
+
+use Illuminate\Support\Facades\DB;
+
+/** Resolves a WHMCS `tblproducts.id` to the local `products.id` via `legacy_id`. */
+class ProductIdResolver
+{
+    /** @var array<int, int>|null */
+    private static ?array $map = null;
+
+    public function resolve(int $legacyProductId): ?int
+    {
+        self::$map ??= DB::table('products')->whereNotNull('legacy_id')->pluck('id', 'legacy_id')->all();
+
+        return self::$map[$legacyProductId] ?? null;
+    }
+
+    public function categoryTypeOf(int $localProductId): ?string
+    {
+        return DB::table('products')
+            ->join('product_categories', 'product_categories.id', '=', 'products.product_categories_id')
+            ->where('products.id', $localProductId)
+            ->value('product_categories.type');
+    }
+}