diff --git a/src/Models/Order.php b/src/Models/Order.php
index f3cfded..3aa7bd3 100644
--- a/src/Models/Order.php
+++ b/src/Models/Order.php
@@ -146,6 +146,8 @@ public function setCommentList(array $CommentList): void
      */
     public function addItem(Item $item): void
     {
+        $item_count = count($this->ItemList);
+        $item->setNumber($item_count + 1);
         $this->ItemList[] = $item;
     }
 
diff --git a/src/Utils/Response.php b/src/Utils/Response.php
index 3f8060b..0938ce9 100644
--- a/src/Utils/Response.php
+++ b/src/Utils/Response.php
@@ -50,48 +50,4 @@ public function getValue($key)
     {
         return (new XmlParser($this->getRawBody()))->getValue($key);
     }
-
-    /**
-     * @return array|string
-     * @throws \JsonException
-     */
-    public function getResult()
-    {
-        return $this->getValue($this->requestMethod . 'Result');
-    }
-
-    /**
-     * @return bool
-     */
-    public function isSuccessful(): bool
-    {
-        return $this->getResult()['ServiceResult'] === 'Successful';
-    }
-
-    /**
-     * @return string
-     * @throws \JsonException
-     */
-    public function getStatus(): string
-    {
-        return $this->getResult()['ServiceResult'];
-    }
-
-    /**
-     * @return string
-     * @throws \JsonException
-     */
-    public function getStatusDesc(): string
-    {
-        return $this->getResult()['ServiceResultDescription'];
-    }
-
-    /**
-     * @return string
-     * @throws \JsonException
-     */
-    public function getErrorCode(): string
-    {
-        return $this->getResult()['ErrorCode'];
-    }
 }