update email template

app/Integrations/Whmcs/Support/RegistrarIdResolver.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Integrations\Whmcs\Support;
+
+use Illuminate\Support\Facades\DB;
+
+/** Resolves a WHMCS registrar module slug (e.g. 'nhanhoa', 'PA') to the local `registrars.id`, matched case-insensitively on short_name. */
+class RegistrarIdResolver
+{
+    /** @var array<string, int>|null lowercase short_name => registrar id */
+    private static ?array $map = null;
+
+    public function resolve(string $whmcsRegistrar): ?int
+    {
+        $whmcsRegistrar = trim($whmcsRegistrar);
+        if ($whmcsRegistrar === '') {
+            return null;
+        }
+
+        self::$map ??= DB::table('registrars')->pluck('id', 'short_name')
+            ->mapWithKeys(fn ($id, $shortName) => [mb_strtolower($shortName) => $id])
+            ->all();
+
+        return self::$map[mb_strtolower($whmcsRegistrar)] ?? null;
+    }
+}