update email template

app/Integrations/Whmcs/Support/CustomerIdResolver.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Integrations\Whmcs\Support;
+
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Resolves a WHMCS `tblclients.id` to the matching local `customers.id`,
+ * bridged through the uuid both sides already share (see ClientWriter).
+ */
+class CustomerIdResolver
+{
+    /** @var array<int, int>|null whmcs client id => local customer id */
+    private static ?array $map = null;
+
+    public function resolve(int $whmcsClientId): ?int
+    {
+        self::$map ??= $this->build();
+
+        return self::$map[$whmcsClientId] ?? null;
+    }
+
+    private function build(): array
+    {
+        $uuidsByWhmcsId = DB::connection('whmcs')->table('tblclients')->pluck('uuid', 'id');
+        $customerIdsByUuid = DB::table('customers')->pluck('id', 'uuid');
+
+        $map = [];
+        foreach ($uuidsByWhmcsId as $whmcsId => $uuid) {
+            if (isset($customerIdsByUuid[$uuid])) {
+                $map[$whmcsId] = $customerIdsByUuid[$uuid];
+            }
+        }
+
+        return $map;
+    }
+}