diff --git a/lib/OpenPayU/Configuration.php b/lib/OpenPayU/Configuration.php
index 92d2896..c145d63 100644
--- a/lib/OpenPayU/Configuration.php
+++ b/lib/OpenPayU/Configuration.php
@@ -86,7 +86,7 @@ class OpenPayU_Configuration
 
     const API_VERSION = '2.1';
     const COMPOSER_JSON = "/composer.json";
-    const DEFAULT_SDK_VERSION = 'PHP SDK 2.2.7';
+    const DEFAULT_SDK_VERSION = 'PHP SDK 2.2.10';
     const OAUTH_CONTEXT = 'pl/standard/user/oauth/authorize';
 
     /**
diff --git a/lib/OpenPayU/Http.php b/lib/OpenPayU/Http.php
index 758ab2e..abc89d4 100644
--- a/lib/OpenPayU/Http.php
+++ b/lib/OpenPayU/Http.php
@@ -73,6 +73,7 @@ public static function doPut($pathUrl, $data, $authType)
      * @param $statusCode
      * @param null $message
      * @throws OpenPayU_Exception
+     * @throws OpenPayU_Exception_Request
      * @throws OpenPayU_Exception_Authorization
      * @throws OpenPayU_Exception_Network
      * @throws OpenPayU_Exception_ServerMaintenance
@@ -86,7 +87,7 @@ public static function throwHttpStatusException($statusCode, $message = null)
 
         switch ($statusCode) {
             case 400:
-                throw new OpenPayU_Exception($message->getStatus().' - '.$statusDesc, $statusCode);
+                throw new OpenPayU_Exception_Request($message, $message->getStatus().' - '.$statusDesc, $statusCode);
                 break;
 
             case 401:
diff --git a/lib/OpenPayU/OpenPayUException.php b/lib/OpenPayU/OpenPayUException.php
index a83f7c2..52401d6 100644
--- a/lib/OpenPayU/OpenPayUException.php
+++ b/lib/OpenPayU/OpenPayUException.php
@@ -13,6 +13,25 @@ class OpenPayU_Exception extends \Exception
 
 }
 
+class OpenPayU_Exception_Request extends OpenPayU_Exception
+{
+    /** @var stdClass|null */
+    private $originalResponseMessage;
+
+    public function __construct($originalResponseMessage, $message = "", $code = 0, $previous = null)
+    {
+        $this->originalResponseMessage = $originalResponseMessage;
+
+        parent::__construct($message, $code, $previous);
+    }
+
+    /** @return null|stdClass */
+    public function getOriginalResponse()
+    {
+        return $this->originalResponseMessage;
+    }
+}
+
 class OpenPayU_Exception_Configuration extends OpenPayU_Exception
 {
 
diff --git a/lib/OpenPayU/Util.php b/lib/OpenPayU/Util.php
index 34c481b..c33b745 100644
--- a/lib/OpenPayU/Util.php
+++ b/lib/OpenPayU/Util.php
@@ -98,14 +98,12 @@ public static function parseSignature($data)
      */
     public static function verifySignature($message, $signature, $signatureKey, $algorithm = 'MD5')
     {
-        $hash = '';
-
         if (isset($signature)) {
-            if ($algorithm == 'MD5') {
+            if ($algorithm === 'MD5') {
                 $hash = md5($message . $signatureKey);
             } else if (in_array($algorithm, array('SHA', 'SHA1', 'SHA-1'))) {
                 $hash = sha1($message . $signatureKey);
-            } else if (in_array($algorithm, array('SHA-256', 'SHA256', 'SHA_256'))) {
+            } else {
                 $hash = hash('sha256', $message . $signatureKey);
             }
 
diff --git a/lib/OpenPayU/v2/Order.php b/lib/OpenPayU/v2/Order.php
index c468978..ba811f7 100644
--- a/lib/OpenPayU/v2/Order.php
+++ b/lib/OpenPayU/v2/Order.php
@@ -3,7 +3,7 @@
 /**
  * OpenPayU Standard Library
  *
- * @copyright  Copyright (c) 2011-2016 PayU
+ * @copyright  Copyright (c) 2011-2018 PayU
  * @license    http://opensource.org/licenses/LGPL-3.0  Open Software License (LGPL 3.0)
  * http://www.payu.com
  * http://developers.payu.com
@@ -15,6 +15,7 @@
 class OpenPayU_Order extends OpenPayU
 {
     const ORDER_SERVICE = 'orders/';
+    const ORDER_TRANSACTION_SERVICE = 'transactions';
     const SUCCESS = 'SUCCESS';
 
     /**
@@ -85,6 +86,33 @@ public static function retrieve($orderId)
         return $result;
     }
 
+    /**
+     * Retrieves information about the order transaction
+     *  - Sends to PayU TransactionRetrieveRequest
+     *
+     * @param string $orderId PayU OrderId sent back in OrderCreateResponse
+     * @return OpenPayU_Result $result Response array with TransactionRetrieveResponse
+     * @throws OpenPayU_Exception
+     */
+    public static function retrieveTransaction($orderId)
+    {
+        if (empty($orderId)) {
+            throw new OpenPayU_Exception('Empty value of orderId');
+        }
+
+        try {
+            $authType = self::getAuth();
+        } catch (OpenPayU_Exception $e) {
+            throw new OpenPayU_Exception($e->getMessage(), $e->getCode());
+        }
+
+        $pathUrl = OpenPayU_Configuration::getServiceUrl() . self::ORDER_SERVICE . $orderId . '/' . self::ORDER_TRANSACTION_SERVICE;
+
+        $result = self::verifyResponse(OpenPayU_Http::doGet($pathUrl, $authType), 'TransactionRetrieveResponse');
+
+        return $result;
+    }
+
     /**
      * Cancels Order
      * - Sends to PayU OrderCancelRequest
@@ -143,7 +171,7 @@ public static function statusUpdate($orderStatusUpdate)
      * Consume notification message
      *
      * @access public
-     * @param $data Request array received from with PayU OrderNotifyRequest
+     * @param $data string Request array received from with PayU OrderNotifyRequest
      * @return null|OpenPayU_Result Response array with OrderNotifyRequest
      * @throws OpenPayU_Exception
      */
@@ -167,6 +195,11 @@ public static function consumeNotification($data)
      * @param string $response
      * @param string $messageName
      * @return null|OpenPayU_Result
+     * @throws OpenPayU_Exception
+     * @throws OpenPayU_Exception_Authorization
+     * @throws OpenPayU_Exception_Network
+     * @throws OpenPayU_Exception_ServerError
+     * @throws OpenPayU_Exception_ServerMaintenance
      */
     public static function verifyResponse($response, $messageName)
     {
@@ -189,12 +222,11 @@ public static function verifyResponse($response, $messageName)
 
         $result = self::build($data);
 
-        if ($httpStatus == 200 || $httpStatus == 201 || $httpStatus == 422 || $httpStatus == 301 || $httpStatus == 302)
-        {
+        if ($httpStatus == 200 || $httpStatus == 201 || $httpStatus == 422 || $httpStatus == 301 || $httpStatus == 302) {
             return $result;
-        } else {
-            OpenPayU_Http::throwHttpStatusException($httpStatus, $result);
         }
+
+        OpenPayU_Http::throwHttpStatusException($httpStatus, $result);
     }
 
     /**
@@ -204,6 +236,7 @@ public static function verifyResponse($response, $messageName)
      * @param array $order an array containing full Order
      * @param array $params an optional array with form elements' params
      * @return string Response html form
+     * @throws OpenPayU_Exception_Configuration
      */
     public static function hostedOrderForm($order, $params = array())
     {