fix kashkool

app/Http/Controllers/Auth/AuthController.php

@@ -164,7 +164,7 @@ class AuthController extends Controller
                 return response()->json(['message' => 'کد نامعتبر می باشد'], 422);
             }
         } else {
-            if ($this->Config('referral_id') == 'required') {
+            if ($cfg->isReferralRequired()) {
                 return response()->json(['message' => 'کد معرف اجباریست'], 422);
             }
         }