diff --git a/ViewModel/Cart/Donmo.php b/ViewModel/Cart/Donmo.php
index 3cd870b..b7b0d3e 100644
--- a/ViewModel/Cart/Donmo.php
+++ b/ViewModel/Cart/Donmo.php
@@ -8,7 +8,7 @@
 
 class Donmo implements ArgumentInterface
 {
-    private mixed $mode;
+    private string $mode;
     private DonmoConfig $donmoConfig;
     private Json $json;
     public function __construct(DonmoConfig $donmoConfig, Json $json)
@@ -20,7 +20,7 @@ public function __construct(DonmoConfig $donmoConfig, Json $json)
 
     public function getIsActive(): bool
     {
-         return $this->donmoConfig->getIsActive();
+        return $this->donmoConfig->getIsActive();
     }
 
     public function getDonmoConfig(): string