diff --git a/src/Message/PxPayAuthorizeRequest.php b/src/Message/PxPayAuthorizeRequest.php
index 8b3d67f..d6549d1 100644
--- a/src/Message/PxPayAuthorizeRequest.php
+++ b/src/Message/PxPayAuthorizeRequest.php
@@ -273,6 +273,10 @@ public function getData()
             $data->Opt = $this->getOpt();
         }
 
+        if ($this->getNotifyUrl()) {
+            $data->UrlCallback = $this->getNotifyUrl();
+        }
+
         if ($this->getForcePaymentMethod()) {
             $data->ForcePaymentMethod = $this->getForcePaymentMethod();
         }
diff --git a/src/Message/PxPayNotificationRequest.php b/src/Message/PxPayNotificationRequest.php
new file mode 100644
index 0000000..3e1554c
--- /dev/null
+++ b/src/Message/PxPayNotificationRequest.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Omnipay\PaymentExpress\Message;
+
+/**
+ * PaymentExpress PxPay Notification (Webhook, Callback) Request
+ */
+class PxPayNotificationRequest extends PxPayCompleteAuthorizeRequest
+{
+    protected function createResponse($data)
+    {
+        return $this->response = new PxPayNotificationResponse($this, simplexml_load_string($data));
+    }
+}
diff --git a/src/Message/PxPayNotificationResponse.php b/src/Message/PxPayNotificationResponse.php
new file mode 100644
index 0000000..d1fe5a9
--- /dev/null
+++ b/src/Message/PxPayNotificationResponse.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Omnipay\PaymentExpress\Message;
+
+use Omnipay\Common\Message\NotificationInterface;
+
+/**
+ * PaymentExpress PxPay Notification (Webhook, Callback) Response
+ */
+class PxPayNotificationResponse extends Response implements NotificationInterface
+{
+    public function getTransactionStatus()
+    {
+        if ($this->isSuccessful()) {
+            return static::STATUS_COMPLETED;
+        }
+
+        // NOTE: Windcave doesn't support static::STATUS_PENDING, which would have an additional check here
+
+        return static::STATUS_FAILED;
+    }
+}
diff --git a/src/PxPayGateway.php b/src/PxPayGateway.php
index f708cdc..f5a74e9 100644
--- a/src/PxPayGateway.php
+++ b/src/PxPayGateway.php
@@ -105,4 +105,10 @@ public function completeCreateCard(array $parameters = array())
     {
         return $this->completeAuthorize($parameters);
     }
+
+    public function acceptNotification(array $parameters = array())
+    {
+        // NOTE: Windcave does not send full data (only result codes identical to completeAuthorize), so it needs send()
+        return $this->createRequest('\Omnipay\PaymentExpress\Message\PxPayNotificationRequest', $parameters)->send();
+    }
 }
diff --git a/tests/Message/PxPayCreateCardRequestTest.php b/tests/Message/PxPayCreateCardRequestTest.php
index 58161da..8fd9523 100644
--- a/tests/Message/PxPayCreateCardRequestTest.php
+++ b/tests/Message/PxPayCreateCardRequestTest.php
@@ -1,35 +1,23 @@
 <?php
-/**
- * @file
- * Created by PhpStorm.
- * User: eileen
- * Date: 7/04/2016
- * Time: 12:25 AM
- */
-
 namespace Omnipay\PaymentExpress\Message;
 
 use Omnipay\Tests\TestCase;
 
-/**
- * Class PxPayCreateCardRequestTest
- * @package Omnipay\PaymentExpress\Message
- */
-class PxPayCreateCardRequestTest extends TestCase{
-
-  /**
-   * Test that we can set the action to purchase.
-   */
-  public function testCreateCardPurchaseSuccess()
-  {
-      $request = new PxPayCreateCardRequest($this->getHttpClient(), $this->getHttpRequest());
-      $request->initialize(
-          array(
-            'returnUrl' => 'abc123',
-            'action' => 'Purchase',
-          )
-      );
-      $request->getData();
-      $this->assertEquals('Purchase', $request->getAction());
-  }
+class PxPayCreateCardRequestTest extends TestCase
+{
+    /**
+     * Test that we can set the action to purchase.
+     */
+    public function testCreateCardPurchaseSuccess()
+    {
+        $request = new PxPayCreateCardRequest($this->getHttpClient(), $this->getHttpRequest());
+        $request->initialize(
+            array(
+              'returnUrl' => 'abc123',
+              'action' => 'Purchase',
+            )
+        );
+        $request->getData();
+        $this->assertEquals('Purchase', $request->getAction());
+    }
 }
diff --git a/tests/PxPayGatewayTest.php b/tests/PxPayGatewayTest.php
index cfc620b..dce7244 100644
--- a/tests/PxPayGatewayTest.php
+++ b/tests/PxPayGatewayTest.php
@@ -2,6 +2,7 @@
 
 namespace Omnipay\PaymentExpress;
 
+use Omnipay\Common\Message\NotificationInterface;
 use Omnipay\Tests\GatewayTestCase;
 
 class PxPayGatewayTest extends GatewayTestCase
@@ -24,7 +25,7 @@ public function testAuthorizeSuccess()
 
         $response = $this->gateway->authorize($this->options)->send();
 
-      $this->_testSuccessfulPurchase($response);
+        $this->_testSuccessfulPurchase($response);
     }
 
     public function testAuthorizeFailure()
@@ -65,7 +66,27 @@ public function testAuthorizeWithTransactionDataSuccess()
 
         $response = $request->send();
 
-      $this->_testSuccessfulPurchase($response);
+        $this->_testSuccessfulPurchase($response);
+    }
+
+    public function testAuthorizeWithAllUrls()
+    {
+        $this->setMockHttpResponse('PxPayPurchaseSuccess.txt');
+
+        $options = array_merge($this->options, array(
+            'cancelUrl' => 'https://www.example.com/cancel',
+            'notifyUrl' => 'https://www.example.com/notify',
+        ));
+
+        $request = $this->gateway->authorize($options);
+
+        $this->assertSame($options['returnUrl'], $request->getReturnUrl());
+        $this->assertSame($options['cancelUrl'], $request->getCancelUrl());
+        $this->assertSame($options['notifyUrl'], $request->getNotifyUrl());
+
+        $response = $request->send();
+
+        $this->_testSuccessfulPurchase($response);
     }
 
     public function testPurchaseSuccess()
@@ -74,7 +95,7 @@ public function testPurchaseSuccess()
 
         $response = $this->gateway->purchase($this->options)->send();
 
-      $this->_testSuccessfulPurchase($response);
+        $this->_testSuccessfulPurchase($response);
     }
 
     public function testPurchaseWithCardReferenceSuccess()
@@ -88,7 +109,7 @@ public function testPurchaseWithCardReferenceSuccess()
 
         $response = $this->gateway->purchase($options)->send();
 
-      $this->_testSuccessfulPurchase($response);
+        $this->_testSuccessfulPurchase($response);
     }
 
     public function testPurchaseFailure()
@@ -172,6 +193,36 @@ public function testCompleteAuthorizeFailure()
         $this->assertSame('Length of the data to decrypt is invalid.', $response->getMessage());
     }
 
+    public function testAcceptNotificationSuccess()
+    {
+        $this->getHttpRequest()->query->replace(array('result' => 'abc123'));
+
+        $this->setMockHttpResponse('PxPayCompletePurchaseSuccess.txt');
+
+        $response = $this->gateway->acceptNotification($this->options);
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertFalse($response->isRedirect());
+        $this->assertSame('0000000103f5dc65', $response->getTransactionReference());
+        $this->assertSame('APPROVED', $response->getMessage());
+        $this->assertSame(NotificationInterface::STATUS_COMPLETED, $response->getTransactionStatus());
+    }
+
+    public function testAcceptNotificationFailure()
+    {
+        $this->getHttpRequest()->query->replace(array('result' => 'abc123'));
+
+        $this->setMockHttpResponse('PxPayCompletePurchaseFailure.txt');
+
+        $response = $this->gateway->acceptNotification($this->options);
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertFalse($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertSame('Length of the data to decrypt is invalid.', $response->getMessage());
+        $this->assertSame(NotificationInterface::STATUS_FAILED, $response->getTransactionStatus());
+    }
+
     public function testCompleteCreateCardSuccess()
     {
         $this->getHttpRequest()->query->replace(array('result' => 'abc123'));
@@ -302,13 +353,14 @@ public function testTestModeEnabled()
 
     private function _testSuccessfulPurchase($response)
     {
-      $this->assertFalse($response->isSuccessful());
-      $this->assertTrue($response->isRedirect());
-      $this->assertNull($response->getTransactionReference());
-      $this->assertNull($response->getMessage());
-      $this->assertSame('https://sec.windcave.com/pxpay/pxpay.aspx?userid=Developer&request=v5H7JrBTzH-4Whs__1iQnz4RGSb9qxRKNR4kIuDP8kIkQzIDiIob9GTIjw_9q_AdRiR47ViWGVx40uRMu52yz2mijT39YtGeO7cZWrL5rfnx0Mc4DltIHRnIUxy1EO1srkNpxaU8fT8_1xMMRmLa-8Fd9bT8Oq0BaWMxMquYa1hDNwvoGs1SJQOAJvyyKACvvwsbMCC2qJVyN0rlvwUoMtx6gGhvmk7ucEsPc_Cyr5kNl3qURnrLKxINnS0trdpU4kXPKOlmT6VacjzT1zuj_DnrsWAPFSFq-hGsow6GpKKciQ0V0aFbAqECN8rl_c-aZWFFy0gkfjnUM4qp6foS0KMopJlPzGAgMjV6qZ0WfleOT64c3E-FRLMP5V_-mILs8a',
-        $response->getRedirectUrl());
-      $this->assertSame('GET', $response->getRedirectMethod());
+        $this->assertFalse($response->isSuccessful());
+        $this->assertTrue($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertNull($response->getMessage());
+        $this->assertSame(
+            'https://sec.windcave.com/pxpay/pxpay.aspx?userid=Developer&request=v5H7JrBTzH-4Whs__1iQnz4RGSb9qxRKNR4kIuDP8kIkQzIDiIob9GTIjw_9q_AdRiR47ViWGVx40uRMu52yz2mijT39YtGeO7cZWrL5rfnx0Mc4DltIHRnIUxy1EO1srkNpxaU8fT8_1xMMRmLa-8Fd9bT8Oq0BaWMxMquYa1hDNwvoGs1SJQOAJvyyKACvvwsbMCC2qJVyN0rlvwUoMtx6gGhvmk7ucEsPc_Cyr5kNl3qURnrLKxINnS0trdpU4kXPKOlmT6VacjzT1zuj_DnrsWAPFSFq-hGsow6GpKKciQ0V0aFbAqECN8rl_c-aZWFFy0gkfjnUM4qp6foS0KMopJlPzGAgMjV6qZ0WfleOT64c3E-FRLMP5V_-mILs8a',
+            $response->getRedirectUrl()
+        );
+        $this->assertSame('GET', $response->getRedirectMethod());
     }
-
 }