diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09c625b..1ba5185 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 2.3.1
+ * Fixed sandbox configuration for card
+
 ## 2.3.0
  * Separated card payment
  * Added sandbox
diff --git a/app/code/community/PayU/Account/Model/Config.php b/app/code/community/PayU/Account/Model/Config.php
index 11ab19a..6c1daf5 100644
--- a/app/code/community/PayU/Account/Model/Config.php
+++ b/app/code/community/PayU/Account/Model/Config.php
@@ -11,7 +11,7 @@ class PayU_Account_Model_Config
     /**
      * @var string self version
      */
-    protected $_pluginVersion = '2.3.0';
+    protected $_pluginVersion = '2.3.1';
 
     /**
      * @var string minimum Magento e-commerce version
diff --git a/app/code/community/PayU/Account/etc/config.xml b/app/code/community/PayU/Account/etc/config.xml
index 3aa582f..cf56cc2 100644
--- a/app/code/community/PayU/Account/etc/config.xml
+++ b/app/code/community/PayU/Account/etc/config.xml
@@ -2,7 +2,7 @@
 <config>
     <modules>
         <PayU_Account>
-            <version>2.3.0</version>
+            <version>2.3.1</version>
         </PayU_Account>
     </modules>
     <global>
diff --git a/app/code/community/PayU/Account/etc/system.xml b/app/code/community/PayU/Account/etc/system.xml
index 59a5602..c2787ef 100644
--- a/app/code/community/PayU/Account/etc/system.xml
+++ b/app/code/community/PayU/Account/etc/system.xml
@@ -219,6 +219,51 @@
                             <show_in_website>1</show_in_website>
                             <show_in_store>1</show_in_store>
                         </oauth_client_secret>
+                        <sandbox_header2 translate="label">
+                            <label>POS parameters - Sandbox mode</label>
+                            <depends><sandbox>1</sandbox></depends>
+                            <frontend_model>adminhtml/system_config_form_field_heading</frontend_model>
+                            <sort_order>120</sort_order>
+                            <show_in_default>1</show_in_default>
+                            <show_in_website>1</show_in_website>
+                            <show_in_store>1</show_in_store>
+                        </sandbox_header2>
+                        <sandbox_pos_id translate="label">
+                            <label>POS ID (pos_id)</label>
+                            <depends><sandbox>1</sandbox></depends>
+                            <frontend_type>text</frontend_type>
+                            <sort_order>130</sort_order>
+                            <show_in_default>1</show_in_default>
+                            <show_in_website>1</show_in_website>
+                            <show_in_store>1</show_in_store>
+                        </sandbox_pos_id>
+                        <sandbox_signature_key translate="label">
+                            <label>Second key (MD5)</label>
+                            <depends><sandbox>1</sandbox></depends>
+                            <frontend_type>text</frontend_type>
+                            <sort_order>140</sort_order>
+                            <show_in_default>1</show_in_default>
+                            <show_in_website>1</show_in_website>
+                            <show_in_store>1</show_in_store>
+                        </sandbox_signature_key>
+                        <sandbox_oauth_client_id translate="label">
+                            <label>OAuth protocol - client_id</label>
+                            <depends><sandbox>1</sandbox></depends>
+                            <frontend_type>text</frontend_type>
+                            <sort_order>150</sort_order>
+                            <show_in_default>1</show_in_default>
+                            <show_in_website>1</show_in_website>
+                            <show_in_store>1</show_in_store>
+                        </sandbox_oauth_client_id>
+                        <sandbox_oauth_client_secret translate="label">
+                            <label>OAuth protocol - client_secret</label>
+                            <depends><sandbox>1</sandbox></depends>
+                            <frontend_type>text</frontend_type>
+                            <sort_order>160</sort_order>
+                            <show_in_default>1</show_in_default>
+                            <show_in_website>1</show_in_website>
+                            <show_in_store>1</show_in_store>
+                        </sandbox_oauth_client_secret>
                         <header5 translate="label">
                             <label>PayU Plugin Information</label>
                             <frontend_model>adminhtml/system_config_form_field_heading</frontend_model>