diff --git a/composer.json b/composer.json
index 8ad28a8..271baa4 100755
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "require": {
         "guzzle/plugin-cookie": "~3.7",
-        "omnipay/common": "~2.3"
+        "omnipay/common": "*"
     },
     "require-dev": {
         "omnipay/tests": "~2.0"
diff --git a/src/Omnipay/WorldPayXML/Gateway.php b/src/Omnipay/WorldPayXML/Gateway.php
index 62e7d2b..2d9af3e 100755
--- a/src/Omnipay/WorldPayXML/Gateway.php
+++ b/src/Omnipay/WorldPayXML/Gateway.php
@@ -7,7 +7,8 @@
 /**
  * WorldPay XML Class
  *
- * @link http://www.worldpay.com/support/bg/xml/kb/dxml_inv.pdf
+ * @link http://support.worldpay.com/support/kb/bg/pdf/bgxmldirect.pdf
+ *       http://support.worldpay.com/support/kb/gg/pdf/omoi.pdf
  */
 class Gateway extends AbstractGateway
 {
@@ -30,12 +31,12 @@ public function getName()
      */
     public function getDefaultParameters()
     {
-        return array(
+        return [
             'installation' => '',
-            'merchant'     => '',
-            'password'     => '',
-            'testMode'     => false,
-        );
+            'merchant' => '',
+            'password' => '',
+            'testMode' => false,
+        ];
     }
 
     /**
@@ -59,7 +60,7 @@ public function getAcceptHeader()
      */
     public function setAcceptHeader($value)
     {
-        return $this->setParameter('acceptHeader', $value);
+        $this->setParameter('acceptHeader', $value);
     }
 
     /**
@@ -79,7 +80,7 @@ public function getInstallation()
      * @param string $value Installation value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setInstallation($value)
     {
@@ -103,7 +104,7 @@ public function getMerchant()
      * @param string $value Merchant value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setMerchant($value)
     {
@@ -127,7 +128,7 @@ public function getPaResponse()
      * @param string $value Pa response value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setPaResponse($value)
     {
@@ -151,7 +152,7 @@ public function getPassword()
      * @param string $value Password value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setPassword($value)
     {
@@ -175,7 +176,7 @@ public function getRedirectCookie()
      * @param string $value Redirect cookie value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setRedirectCookie($value)
     {
@@ -199,7 +200,7 @@ public function getRedirectEcho()
      * @param string $value Redirect echo value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setRedirectEcho($value)
     {
@@ -223,7 +224,7 @@ public function getSession()
      * @param string $value Session value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setSession($value)
     {
@@ -247,7 +248,7 @@ public function getUserAgentHeader()
      * @param string $value User agent header value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setUserAgentHeader($value)
     {
@@ -271,7 +272,7 @@ public function getUserIP()
      * @param string $value User ip value
      *
      * @access public
-     * @return void
+     * @return $this
      */
     public function setUserIP($value)
     {
@@ -286,11 +287,115 @@ public function setUserIP($value)
      * @access public
      * @return \Omnipay\WorldPayXML\Message\PurchaseRequest
      */
-    public function purchase(array $parameters = array())
+    public function purchase(array $parameters = [])
     {
         return $this->createRequest(
             '\Omnipay\WorldPayXML\Message\PurchaseRequest',
             $parameters
         );
     }
+
+    /**
+     * Refund
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\RefundRequest
+     */
+    public function refund(array $parameters = [])
+    {
+        return $this->createRequest('\Omnipay\WorldPayXML\Message\RefundRequest', $parameters);
+    }
+
+    /**
+     * Cancel
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\CancelRequest
+     */
+    public function cancel(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\CancelRequest', $parameters);
+    }
+
+    /**
+     * Authorise
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\AuthorisationRequest
+     */
+    public function authorise(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\AuthorisationRequest', $parameters);
+    }
+
+    /**
+     * Backoffice Code
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\BackOfficeCodeRequest
+     */
+    public function backOfficeCode(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\BackOfficeCodeRequest', $parameters);
+    }
+
+    /**
+     * Capture
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\CaptureRequest
+     */
+    public function capture(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\CaptureRequest', $parameters);
+    }
+
+    /**
+     * Inquiry
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\InquiryRequest
+     */
+    public function inquiry(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\InquiryRequest', $parameters);
+    }
+
+    /**
+     * Increase Authorisation
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\IncreaseAuthorisationRequest
+     */
+    public function increaseAuthorisation(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\IncreaseAuthorisationRequest', $parameters);
+    }
+
+    /**
+     * Void
+     *
+     * @param array $parameters Parameters
+     *
+     * @access public
+     * @return \Omnipay\WorldPayXML\Message\VoidRequest
+     */
+    public function void(array $parameters = [])
+    {
+        return $this->createRequest('Omnipay\WorldPayXML\Message\VoidRequest', $parameters);
+    }
 }
diff --git a/src/Omnipay/WorldPayXML/Message/AbstractRequest.php b/src/Omnipay/WorldPayXML/Message/AbstractRequest.php
new file mode 100644
index 0000000..f2d0cd1
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/AbstractRequest.php
@@ -0,0 +1,351 @@
+<?php
+/**
+ * Abstract class that all Requests must extend.
+ */
+namespace Omnipay\WorldPayXML\Message;
+
+use Guzzle\Plugin\Cookie\Cookie;
+use Guzzle\Plugin\Cookie\CookiePlugin;
+use Guzzle\Plugin\Cookie\CookieJar\ArrayCookieJar;
+
+/**
+ * Class AbstractRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+abstract class AbstractRequest extends \Omnipay\Common\Message\AbstractRequest
+{
+    /**
+     * The base URL for the live service.
+     */
+    const EP_HOST_LIVE = 'https://secure.worldpay.com';
+
+    /**
+     * The base URL for the sandbox service.
+     */
+    const EP_HOST_TEST = 'https://secure-test.worldpay.com';
+
+    /**
+     * The service URI
+     */
+    const EP_PATH = '/jsp/merchant/xml/paymentService.jsp';
+
+    /**
+     * The curent Worldpay XML APi version.
+     */
+    const VERSION = '1.4';
+
+    /**
+     * Constants used to indicate the type of request being made.
+     */
+
+    /**
+     * Payment request
+     */
+    const PAYMENT_REQUEST = 1;
+
+    /**
+     * Payment modification
+     */
+    const PAYMENT_MODIFY = 2;
+
+    /**
+     * Cancel request
+     */
+    const CANCEL_REQUEST = 3;
+
+    /**
+     * Capture request
+     */
+    const CAPTURE_REQUEST = 4;
+
+    /**
+     * Refund request
+     */
+    const REFUND_REQUEST = 5;
+
+    /**
+     * Backoffice code request
+     */
+    const BACK_OFFICE_CODE_REQUEST = 6;
+
+    /**
+     * Authorisation code request
+     */
+    const AUTHORISATION_CODE_REQUEST = 7;
+
+    /**
+     * Inquiry request
+     */
+    const INQUIRY_REQUEST = 8;
+
+    /**
+     * Increase Authorisation request
+     */
+    const INCREASE_AUTHORISATION_REQUEST = 9;
+
+    /**
+     * Void (Cancel or Refund dependant on current payment status) request.
+     */
+    const VOID_REQUEST = 10;
+
+    /**
+     * Observers. Used to report requests and responses to.
+     *
+     * @var array
+     */
+    private $observers = [];
+
+    /**
+     * Get merchant
+     *
+     * @access public
+     * @return string
+     */
+    public function getMerchant()
+    {
+        return $this->getParameter('merchant');
+    }
+
+    /**
+     * Set merchant
+     *
+     * @param string $value Merchant
+     *
+     * @access public
+     * @return void
+     */
+    public function setMerchant($value)
+    {
+        $this->setParameter('merchant', $value);
+    }
+
+    /**
+     * Get password
+     *
+     * @access public
+     * @return string
+     */
+    public function getPassword()
+    {
+        return $this->getParameter('password');
+    }
+
+    /**
+     * Set password
+     *
+     * @param string $value Password
+     *
+     * @access public
+     * @return void
+     */
+    public function setPassword($value)
+    {
+        $this->setParameter('password', $value);
+    }
+
+    /**
+     * Get redirect cookie
+     *
+     * @access public
+     * @return string
+     */
+    public function getRedirectCookie()
+    {
+        return $this->getParameter('redirect_cookie');
+    }
+
+    /**
+     * Set redirect cookie
+     *
+     * @param string $value Password
+     *
+     * @access public
+     * @return void
+     */
+    public function setRedirectCookie($value)
+    {
+        $this->setParameter('redirect_cookie', $value);
+    }
+
+    /**
+     * Set up the base SimpleXMLElelment for the request with items common to all requests.
+     *
+     * @return \SimpleXMLElement
+     */
+    protected function getBase()
+    {
+        $data = new \SimpleXMLElement('<paymentService />');
+        $data->addAttribute('version', self::VERSION);
+        $data->addAttribute('merchantCode', $this->getMerchant());
+
+        return $data;
+    }
+
+    /**
+     * Get installation
+     *
+     * @access public
+     * @return string
+     */
+    public function getInstallation()
+    {
+        return $this->getParameter('installation');
+    }
+
+    /**
+     * Set installation
+     *
+     * @param string $value Installation
+     *
+     * @access public
+     * @return void
+     */
+    public function setInstallation($value)
+    {
+        $this->setParameter('installation', $value);
+    }
+
+    /**
+     * Send data
+     *
+     * @param \SimpleXMLElement $data Data
+     *
+     * @access public
+     * @return \Omnipay\Common\Message\ResponseInterface
+     */
+    public function sendData($data)
+    {
+        $implementation = new \DOMImplementation();
+
+        $dtd = $implementation->createDocumentType(
+            'paymentService',
+            '-//WorldPay//DTD WorldPay PaymentService v1//EN',
+            'http://dtd.worldpay.com/paymentService_v1.dtd'
+        );
+
+        $document = $implementation->createDocument(null, '', $dtd);
+        $document->encoding = 'utf-8';
+
+        $node = $document->importNode(dom_import_simplexml($data), true);
+        $document->appendChild($node);
+
+        $authorisation = base64_encode(
+            $this->getMerchant() . ':' . $this->getPassword()
+        );
+
+        $headers = [
+            'Authorization' => 'Basic ' . $authorisation,
+            'Content-Type' => 'text/xml; charset=utf-8',
+        ];
+
+        $cookieJar = new ArrayCookieJar();
+
+        $redirectCookie = $this->getRedirectCookie();
+
+        if (!empty($redirectCookie)) {
+            $url = parse_url($this->getEndpoint());
+
+            $cookieJar->add(
+                new Cookie(
+                    [
+                        'domain' => $url['host'],
+                        'name' => 'machine',
+                        'path' => '/',
+                        'value' => $redirectCookie,
+                    ]
+                )
+            );
+        }
+
+        $this->cookiePlugin = new CookiePlugin($cookieJar);
+
+        $this->httpClient->addSubscriber($this->cookiePlugin);
+
+        $xml = $document->saveXML();
+
+        $this->notify(
+            [
+                'request' => preg_replace(
+                    '#\<cvc\>([0-9]{3,4})\<\/cvc\>#',
+                    '<cvc>***</cvc>',
+                    preg_replace(
+                        '#\<cardNumber\>([0-9]{10,})\<\/cardNumber\>#',
+                        '<cardNumber>**** **** **** ****</cardNumber>',
+                        $xml
+                    )
+                ),
+            ]
+        );
+
+        $httpResponse = $this->httpClient
+            ->post($this->getEndpoint(), $headers, $xml)
+            ->send();
+
+        $this->notify(['response' => (string)$httpResponse->getBody()]);
+
+        return $this->response = Response::make(
+            $this,
+            $httpResponse->getBody()
+        );
+    }
+
+    /**
+     * Get endpoint
+     *
+     * Returns endpoint depending on test mode
+     *
+     * @access protected
+     * @return string
+     */
+    protected function getEndpoint()
+    {
+        if ($this->getTestMode()) {
+            return self::EP_HOST_TEST . self::EP_PATH;
+        }
+
+        return self::EP_HOST_LIVE . self::EP_PATH;
+    }
+
+    /**
+     * Attach an observer.
+     *
+     * @param Observer $observer
+     */
+    public function attach(Observer $observer)
+    {
+        $this->observers[] = $observer;
+    }
+
+    /**
+     * Detach an attached observer.
+     *
+     * @param Observer $observer
+     */
+    public function detach(Observer $observer)
+    {
+        $this->observers = array_filter(
+            $this->observers,
+            function ($a) use ($observer) {
+                return (!($a === $observer));
+            }
+        );
+    }
+
+    /**
+     * Notify all observers.
+     *
+     * @param $data
+     */
+    public function notify($data)
+    {
+        foreach ($this->observers as $observer) {
+            $observer->update($this, $data);
+        }
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    abstract public function getTransactionType();
+}
diff --git a/src/Omnipay/WorldPayXML/Message/AuthorisationRequest.php b/src/Omnipay/WorldPayXML/Message/AuthorisationRequest.php
new file mode 100644
index 0000000..39138aa
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/AuthorisationRequest.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * Authorisation code request
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class AuthorisationRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class AuthorisationRequest extends ModifyRequest
+{
+
+    /**
+     * Set the authorisation code parameter.
+     *
+     * @param string $value Value to set the parameter to
+     *
+     * @return $this
+     */
+    public function setAuthorisation($value)
+    {
+        return $this->setParameter('authorisation', $value);
+    }
+
+    /**
+     * Get the authorisation code.
+     *
+     * @return string
+     */
+    public function getAuthorisation()
+    {
+        return $this->getParameter('authorisation');
+    }
+
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $authorise = $data->modify->orderModification->addChild('authorise');
+        $authorise->addAttribute('authorisationCode', $this->getAuthorisation());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::AUTHORISATION_CODE_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/BackOfficeCodeRequest.php b/src/Omnipay/WorldPayXML/Message/BackOfficeCodeRequest.php
new file mode 100644
index 0000000..dfe5600
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/BackOfficeCodeRequest.php
@@ -0,0 +1,58 @@
+<?php
+/**
+ * Backoffice code request.
+ */
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class BackOfficeCodeRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class BackOfficeCodeRequest extends ModifyRequest
+{
+
+    /**
+     * Set the backoffice code parameter.
+     *
+     * @param string $value The value to set the backoffice code to
+     *
+     * @return $this
+     */
+    public function setBackOfficeCode($value)
+    {
+        return $this->setParameter('backOfficeCode', $value);
+    }
+
+    /**
+     * Get the backoffice code
+     *
+     * @return string
+     */
+    public function getBackOfficeCode()
+    {
+        return $this->getParameter('backOfficeCode');
+    }
+
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $addBackOfficeCode = $data->modify->orderModification->addChild('addBackOfficeCode');
+        $addBackOfficeCode->addAttribute('backOfficeCode', $this->getBackOfficeCode());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::BACK_OFFICE_CODE_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/CancelRequest.php b/src/Omnipay/WorldPayXML/Message/CancelRequest.php
new file mode 100644
index 0000000..49eaf1f
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/CancelRequest.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * Backoffice code request.
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+use Omnipay\Common\Message\RequestInterface;
+
+/**
+ * Class CancelRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class CancelRequest extends ModifyRequest implements RequestInterface
+{
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $data->modify->orderModification->addChild('cancel');
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     *
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::CANCEL_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/CaptureRequest.php b/src/Omnipay/WorldPayXML/Message/CaptureRequest.php
new file mode 100644
index 0000000..a80624f
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/CaptureRequest.php
@@ -0,0 +1,40 @@
+<?php
+/**
+ * Capture request
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class CaptureRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class CaptureRequest extends ModifyRequest
+{
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $capture = $data->modify->orderModification->addChild('capture');
+        $amount = $capture->addChild('amount');
+        $amount->addAttribute('value', $this->getAmountInteger());
+        $amount->addAttribute('currencyCode', $this->getCurrency());
+        $amount->addAttribute('exponent', $this->getCurrencyDecimalPlaces());
+        $amount->addAttribute('debitCreditIndicator', $this->getDebitCreditIndicator());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::CAPTURE_REQUEST;
+    }
+}
\ No newline at end of file
diff --git a/src/Omnipay/WorldPayXML/Message/IncreaseAuthorisationRequest.php b/src/Omnipay/WorldPayXML/Message/IncreaseAuthorisationRequest.php
new file mode 100644
index 0000000..8ad956c
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/IncreaseAuthorisationRequest.php
@@ -0,0 +1,38 @@
+<?php
+/**
+ * Increase authorisation request
+ */
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class IncreaseAuthorisationRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class IncreaseAuthorisationRequest extends ModifyRequest
+{
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $authorise = $data->modify->orderModification->addChild('increaseAuthorisation');
+        $amount = $authorise->addChild('amount');
+        $amount->addAttribute('value', $this->getAmountInteger());
+        $amount->addAttribute('currencyCode', $this->getCurrency());
+        $amount->addAttribute('exponent', $this->getCurrencyDecimalPlaces());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::INCREASE_AUTHORISATION_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/InquiryRequest.php b/src/Omnipay/WorldPayXML/Message/InquiryRequest.php
new file mode 100644
index 0000000..aebc401
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/InquiryRequest.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * Inquiry request.
+ */
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class InquiryRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+class InquiryRequest extends AbstractRequest
+{
+    /**
+     * Get the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $inquiry = $data->addChild('inquiry');
+        $orderInquiry = $inquiry->addChild('orderInquiry');
+        $orderInquiry->addAttribute('orderCode', $this->getTransactionId());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     *
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::INQUIRY_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/ModifyRequest.php b/src/Omnipay/WorldPayXML/Message/ModifyRequest.php
new file mode 100644
index 0000000..ad2b806
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/ModifyRequest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Abstract class which is extended by all modification request classes.
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Class ModifyRequest
+ * @package Omnipay\WorldPayXML\Message
+ */
+abstract class ModifyRequest extends AbstractRequest
+{
+
+    /**
+     * Set the debit/credit parameter.
+     *
+     * @param string $value Either 'debit' or 'credit'.
+     *
+     * @return $this
+     */
+    public function setDebitCreditIndicator($value)
+    {
+        return $this->setParameter('debitCreditIndicator', $value);
+    }
+
+    /**
+     * Get the debit/credit parameter.
+     *
+     * @return string
+     */
+    public function getDebitCreditIndicator()
+    {
+        return $this->getParameter('debitCreditIndicator');
+    }
+
+    /**
+     * Extends the base XML from the Abstract request class method to include common elements for all modififcation
+     * requests.
+     *
+     * @return \SimpleXMLElement
+     */
+    protected function getBase()
+    {
+        $data = parent::getBase();
+        $modify = $data->addChild('modify');
+        $orderModification = $modify->addChild('orderModification');
+        $orderModification->addAttribute('orderCode', $this->getTransactionId());
+
+        return $data;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/ModifyResponse.php b/src/Omnipay/WorldPayXML/Message/ModifyResponse.php
new file mode 100644
index 0000000..3dcaa55
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/ModifyResponse.php
@@ -0,0 +1,82 @@
+<?php
+/**
+ * Response for a modification request, with the exception of an Increase Authorisation request.
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+use Omnipay\Common\Message\RequestInterface;
+
+/**
+ * Class ModifyResponse
+ * @package Omnipay\WorldPayXML\Message
+ */
+class ModifyResponse extends Response
+{
+    /**
+     * Constructor
+     *
+     * @param RequestInterface $request Request
+     * @param string           $data    Data
+     *
+     * @access public
+     */
+    public function __construct(RequestInterface $request, $data)
+    {
+        $this->request = $request;
+
+        $this->data = $data;
+    }
+
+    /**
+     * Get is successful
+     *
+     * @access public
+     * @return boolean
+     */
+    public function isSuccessful()
+    {
+        if (isset($this->data->ok)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Get the message from the response.
+     *
+     * @return string
+     */
+    public function getMessage()
+    {
+        if ($this->isSuccessful()) {
+            return 'SUCCESS';
+        }
+
+        return (string)$this->data->error;
+    }
+
+    /**
+     * Get transaction reference
+     *
+     * @access public
+     * @return string
+     */
+    public function getTransactionReference()
+    {
+        if ($this->data->ok instanceof \SimpleXMLElement) {
+            foreach ($this->data->ok->children() as $child) {
+                if ($child instanceof \SimpleXMLElement) {
+                    $attributes = $child->attributes();
+
+                    if (isset($attributes['orderCode'])) {
+                        return $attributes['orderCode'];
+                    }
+                }
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/Observer.php b/src/Omnipay/WorldPayXML/Message/Observer.php
new file mode 100644
index 0000000..866d558
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/Observer.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * The interface that must be followed by observers.
+ */
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Interface Observer
+ * @package Omnipay\WorldPayXML\Message
+ */
+interface Observer
+{
+
+    /**
+     * Method to be implemented by observers.
+     *
+     * @param AbstractRequest $observable The observable instance.
+     * @param array           $data       Extra data to be returned from the observable.
+     *
+     * @return mixed
+     */
+    public function update(AbstractRequest $observable, array $data);
+}
diff --git a/src/Omnipay/WorldPayXML/Message/PurchaseRequest.php b/src/Omnipay/WorldPayXML/Message/PurchaseRequest.php
index 64f85cc..c6733e4 100755
--- a/src/Omnipay/WorldPayXML/Message/PurchaseRequest.php
+++ b/src/Omnipay/WorldPayXML/Message/PurchaseRequest.php
@@ -1,25 +1,16 @@
 <?php
-
+/**
+ * Purchase request.
+ */
 namespace Omnipay\WorldPayXML\Message;
 
-use Guzzle\Plugin\Cookie\Cookie;
-use Guzzle\Plugin\Cookie\CookiePlugin;
-use Guzzle\Plugin\Cookie\CookieJar\ArrayCookieJar;
 use Omnipay\Common\CreditCard;
-use Omnipay\Common\Message\AbstractRequest;
 
 /**
  * Omnipay WorldPay XML Purchase Request
  */
 class PurchaseRequest extends AbstractRequest
 {
-    const EP_HOST_LIVE = 'https://secure.worldpay.com';
-    const EP_HOST_TEST = 'https://secure-test.worldpay.com';
-
-    const EP_PATH = '/jsp/merchant/xml/paymentService.jsp';
-
-    const VERSION = '1.4';
-
     /**
      * @var \Guzzle\Plugin\Cookie\CookiePlugin
      *
@@ -62,54 +53,6 @@ public function getCookiePlugin()
         return $this->cookiePlugin;
     }
 
-    /**
-     * Get installation
-     *
-     * @access public
-     * @return string
-     */
-    public function getInstallation()
-    {
-        return $this->getParameter('installation');
-    }
-
-    /**
-     * Set installation
-     *
-     * @param string $value Installation
-     *
-     * @access public
-     * @return void
-     */
-    public function setInstallation($value)
-    {
-        return $this->setParameter('installation', $value);
-    }
-
-    /**
-     * Get merchant
-     *
-     * @access public
-     * @return string
-     */
-    public function getMerchant()
-    {
-        return $this->getParameter('merchant');
-    }
-
-    /**
-     * Set merchant
-     *
-     * @param string $value Merchant
-     *
-     * @access public
-     * @return void
-     */
-    public function setMerchant($value)
-    {
-        return $this->setParameter('merchant', $value);
-    }
-
     /**
      * Get pa response
      *
@@ -134,54 +77,6 @@ public function setPaResponse($value)
         return $this->setParameter('pa_response', $value);
     }
 
-    /**
-     * Get password
-     *
-     * @access public
-     * @return string
-     */
-    public function getPassword()
-    {
-        return $this->getParameter('password');
-    }
-
-    /**
-     * Set password
-     *
-     * @param string $value Password
-     *
-     * @access public
-     * @return void
-     */
-    public function setPassword($value)
-    {
-        return $this->setParameter('password', $value);
-    }
-
-    /**
-     * Get redirect cookie
-     *
-     * @access public
-     * @return string
-     */
-    public function getRedirectCookie()
-    {
-        return $this->getParameter('redirect_cookie');
-    }
-
-    /**
-     * Set redirect cookie
-     *
-     * @param string $value Password
-     *
-     * @access public
-     * @return void
-     */
-    public function setRedirectCookie($value)
-    {
-        return $this->setParameter('redirect_cookie', $value);
-    }
-
     /**
      * Get redirect echo
      *
@@ -289,13 +184,14 @@ public function getData()
         $this->validate('amount', 'card');
         $this->getCard()->validate();
 
-        $data = new \SimpleXMLElement('<paymentService />');
-        $data->addAttribute('version', self::VERSION);
-        $data->addAttribute('merchantCode', $this->getMerchant());
+        $data = $this->getBase();
 
         $order = $data->addChild('submit')->addChild('order');
         $order->addAttribute('orderCode', $this->getTransactionId());
-        $order->addAttribute('installationId', $this->getInstallation());
+        $installationId = $this->getInstallation();
+        if (!empty($installationId)) {
+            $order->addAttribute('installationId', $installationId);
+        }
 
         $order->addChild('description', $this->getDescription());
 
@@ -306,18 +202,18 @@ public function getData()
 
         $payment = $order->addChild('paymentDetails');
 
-        $codes = array(
-            CreditCard::BRAND_AMEX        => 'AMEX-SSL',
-            CreditCard::BRAND_DANKORT     => 'DANKORT-SSL',
+        $codes = [
+            CreditCard::BRAND_AMEX => 'AMEX-SSL',
+            CreditCard::BRAND_DANKORT => 'DANKORT-SSL',
             CreditCard::BRAND_DINERS_CLUB => 'DINERS-SSL',
-            CreditCard::BRAND_DISCOVER    => 'DISCOVER-SSL',
-            CreditCard::BRAND_JCB         => 'JCB-SSL',
-            CreditCard::BRAND_LASER       => 'LASER-SSL',
-            CreditCard::BRAND_MAESTRO     => 'MAESTRO-SSL',
-            CreditCard::BRAND_MASTERCARD  => 'ECMC-SSL',
-            CreditCard::BRAND_SWITCH      => 'MAESTRO-SSL',
-            CreditCard::BRAND_VISA        => 'VISA-SSL'
-        );
+            CreditCard::BRAND_DISCOVER => 'DISCOVER-SSL',
+            CreditCard::BRAND_JCB => 'JCB-SSL',
+            CreditCard::BRAND_LASER => 'LASER-SSL',
+            CreditCard::BRAND_MAESTRO => 'MAESTRO-SSL',
+            CreditCard::BRAND_MASTERCARD => 'ECMC-SSL',
+            CreditCard::BRAND_SWITCH => 'MAESTRO-SSL',
+            CreditCard::BRAND_VISA => 'VISA-SSL',
+        ];
 
         $card = $payment->addChild($codes[$this->getCard()->getBrand()]);
         $card->addChild('cardNumber', $this->getCard()->getNumber());
@@ -329,8 +225,8 @@ public function getData()
         $card->addChild('cardHolderName', $this->getCard()->getName());
 
         if (
-                $this->getCard()->getBrand() == CreditCard::BRAND_MAESTRO
-             || $this->getCard()->getBrand() == CreditCard::BRAND_SWITCH
+            $this->getCard()->getBrand() == CreditCard::BRAND_MAESTRO
+            || $this->getCard()->getBrand() == CreditCard::BRAND_SWITCH
         ) {
             $start = $card->addChild('startDate')->addChild('date');
             $start->addAttribute('month', $this->getCard()->getStartDate('m'));
@@ -346,9 +242,14 @@ public function getData()
         $address->addChild('postalCode', $this->getCard()->getPostcode());
         $address->addChild('countryCode', $this->getCard()->getCountry());
 
-        $session = $payment->addChild('session');
-        $session->addAttribute('shopperIPAddress', $this->getClientIP());
-        $session->addAttribute('id', $this->getSession());
+        $clientIp = $this->getClientIP();
+        $sessionId = $this->getSession();
+
+        if (!empty($clientIp) && !empty($sessionId)) {
+            $session = $payment->addChild('session');
+            $session->addAttribute('shopperIPAddress', $clientIp);
+            $session->addAttribute('id', $sessionId);
+        }
 
         $paResponse = $this->getPaResponse();
 
@@ -368,6 +269,16 @@ public function getData()
             );
         }
 
+        $shippingAddress = $order->addChild('shippingAddress');
+        $address = $shippingAddress->addChild('address');
+        $address->addChild('firstName', $this->getCard()->getShippingFirstName());
+        $address->addChild('lastName', $this->getCard()->getShippingLastName());
+        $address->addChild('street', $this->getCard()->getShippingAddress1());
+        $address->addChild('postalCode', $this->getCard()->getShippingPostcode());
+        $address->addChild('city', $this->getCard()->getShippingCity());
+        $address->addChild('countryCode', $this->getCard()->getShippingCountry());
+        $address->addChild('telephoneNumber', $this->getCard()->getshippingPhone());
+
         $browser = $shopper->addChild('browser');
         $browser->addChild('acceptHeader', $this->getAcceptHeader());
         $browser->addChild('userAgentHeader', $this->getUserAgentHeader());
@@ -382,87 +293,11 @@ public function getData()
     }
 
     /**
-     * Send data
-     *
-     * @param \SimpleXMLElement $data Data
-     *
-     * @access public
-     * @return RedirectResponse
+     * Return a value to indicate the transaction type.
+     * @return integer
      */
-    public function sendData($data)
+    public function getTransactionType()
     {
-        $implementation = new \DOMImplementation();
-
-        $dtd = $implementation->createDocumentType(
-            'paymentService',
-            '-//WorldPay//DTD WorldPay PaymentService v1//EN',
-            'http://dtd.worldpay.com/paymentService_v1.dtd'
-        );
-
-        $document = $implementation->createDocument(null, '', $dtd);
-        $document->encoding = 'utf-8';
-
-        $node = $document->importNode(dom_import_simplexml($data), true);
-        $document->appendChild($node);
-
-        $authorisation = base64_encode(
-            $this->getMerchant() . ':' . $this->getPassword()
-        );
-
-        $headers = array(
-            'Authorization' => 'Basic ' . $authorisation,
-            'Content-Type'  => 'text/xml; charset=utf-8'
-        );
-
-        $cookieJar = new ArrayCookieJar();
-
-        $redirectCookie = $this->getRedirectCookie();
-
-        if (!empty($redirectCookie)) {
-            $url = parse_url($this->getEndpoint());
-
-            $cookieJar->add(
-                new Cookie(
-                    array(
-                        'domain' => $url['host'],
-                        'name'   => 'machine',
-                        'path'   => '/',
-                        'value'  => $redirectCookie
-                    )
-                )
-            );
-        }
-
-        $this->cookiePlugin = new CookiePlugin($cookieJar);
-
-        $this->httpClient->addSubscriber($this->cookiePlugin);
-
-        $xml = $document->saveXML();
-
-        $httpResponse = $this->httpClient
-            ->post($this->getEndpoint(), $headers, $xml)
-            ->send();
-
-        return $this->response = new RedirectResponse(
-            $this,
-            $httpResponse->getBody()
-        );
-    }
-
-    /**
-     * Get endpoint
-     *
-     * Returns endpoint depending on test mode
-     *
-     * @access protected
-     * @return string
-     */
-    protected function getEndpoint()
-    {
-        if ($this->getTestMode()) {
-            return self::EP_HOST_TEST . self::EP_PATH;
-        }
-
-        return self::EP_HOST_LIVE . self::EP_PATH;
+        return static::PAYMENT_REQUEST;
     }
 }
diff --git a/src/Omnipay/WorldPayXML/Message/RedirectResponse.php b/src/Omnipay/WorldPayXML/Message/RedirectResponse.php
index 2d98c38..26aaba5 100755
--- a/src/Omnipay/WorldPayXML/Message/RedirectResponse.php
+++ b/src/Omnipay/WorldPayXML/Message/RedirectResponse.php
@@ -1,5 +1,7 @@
 <?php
-
+/**
+ * Response returned when the response from Worldpay indicates that a redirect is required.
+ */
 namespace Omnipay\WorldPayXML\Message;
 
 use Omnipay\Common\Message\RedirectResponseInterface;
@@ -47,10 +49,10 @@ public function getRedirectEcho()
      */
     public function getRedirectData()
     {
-        return array(
-            'PaReq'   => $this->data->requestInfo->request3DSecure->paRequest,
-            'TermUrl' => $this->request->getTermUrl()
-        );
+        return [
+            'PaReq' => $this->data->requestInfo->request3DSecure->paRequest,
+            'TermUrl' => $this->request->getTermUrl(),
+        ];
     }
 
     /**
diff --git a/src/Omnipay/WorldPayXML/Message/RefundRequest.php b/src/Omnipay/WorldPayXML/Message/RefundRequest.php
new file mode 100644
index 0000000..900a51a
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/RefundRequest.php
@@ -0,0 +1,36 @@
+<?php
+/**
+ * Refund request.
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Omnipay WorldPay XML Refund Request
+ */
+class RefundRequest extends ModifyRequest
+{
+
+    public function getData()
+    {
+        $data = $this->getBase();
+        $refund = $data->modify->orderModification->addChild('refund');
+        $amount = $refund->addChild('amount');
+        $amount->addAttribute('value', $this->getAmountInteger());
+        $amount->addAttribute('currencyCode', $this->getCurrency());
+        $amount->addAttribute('exponent', $this->getCurrencyDecimalPlaces());
+        $amount->addAttribute('debitCreditIndicator', $this->getDebitCreditIndicator());
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     *
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::REFUND_REQUEST;
+    }
+}
diff --git a/src/Omnipay/WorldPayXML/Message/Response.php b/src/Omnipay/WorldPayXML/Message/Response.php
index 0cfb834..e6b3ca0 100755
--- a/src/Omnipay/WorldPayXML/Message/Response.php
+++ b/src/Omnipay/WorldPayXML/Message/Response.php
@@ -1,5 +1,7 @@
 <?php
-
+/**
+ * WorldPay XML Response
+ */
 namespace Omnipay\WorldPayXML\Message;
 
 use DOMDocument;
@@ -8,10 +10,52 @@
 use Omnipay\Common\Message\RequestInterface;
 
 /**
- * WorldPay XML Response
+ * Class Response
+ * @package Omnipay\WorldPayXML\Message
  */
 class Response extends AbstractResponse
 {
+
+    /**
+     * @param RequestInterface $request
+     * @param                  $data
+     *
+     * @return ModifyResponse|RedirectResponse|Response
+     * @throws InvalidResponseException
+     */
+    public static function make(RequestInterface $request, $data)
+    {
+        if (empty($data)) {
+            throw new InvalidResponseException();
+        }
+
+        $responseDom = new DOMDocument;
+        $responseDom->loadXML($data);
+
+        if ($request instanceof \Omnipay\WorldPayXML\Message\ModifyRequest &&
+            !($request instanceof \Omnipay\WorldPayXML\Message\IncreaseAuthorisationRequest)
+        ) {
+            $xmlData = simplexml_import_dom(
+                $responseDom->documentElement->firstChild
+            );
+
+            return new ModifyResponse(
+                $request,
+                $xmlData
+            );
+        } else {
+            $xmlData = simplexml_import_dom(
+                $responseDom->documentElement->firstChild->firstChild
+            );
+        }
+
+        if ($xmlData->requestInfo) {
+            return new RedirectResponse($request, $xmlData);
+        } else {
+            return new Response($request, $xmlData);
+        }
+    }
+
     /**
      * Constructor
      *
@@ -22,18 +66,13 @@ class Response extends AbstractResponse
      */
     public function __construct(RequestInterface $request, $data)
     {
-        $this->request = $request;
-
         if (empty($data)) {
             throw new InvalidResponseException();
         }
 
-        $responseDom = new DOMDocument;
-        $responseDom->loadXML($data);
+        $this->request = $request;
 
-        $this->data = simplexml_import_dom(
-            $responseDom->documentElement->firstChild->firstChild
-        );
+        $this->data = $data;
     }
 
     /**
@@ -44,13 +83,13 @@ public function __construct(RequestInterface $request, $data)
      */
     public function getMessage()
     {
-        $codes = array(
-            0  => 'AUTHORISED',
-            2  => 'REFERRED',
-            3  => 'INVALID ACCEPTOR',
-            4  => 'HOLD CARD',
-            5  => 'REFUSED',
-            8  => 'APPROVE AFTER IDENTIFICATION',
+        $codes = [
+            0 => 'AUTHORISED',
+            2 => 'REFERRED',
+            3 => 'INVALID ACCEPTOR',
+            4 => 'HOLD CARD',
+            5 => 'REFUSED',
+            8 => 'APPROVE AFTER IDENTIFICATION',
             12 => 'INVALID TRANSACTION',
             13 => 'INVALID AMOUNT',
             14 => 'INVALID ACCOUNT',
@@ -89,8 +128,8 @@ public function getMessage()
             91 => 'CREDITCARD ISSUER TEMPORARILY NOT REACHABLE',
             92 => 'CREDITCARD TYPE NOT PROCESSED BY ACQUIRER',
             94 => 'DUPLICATE REQUEST ERROR',
-            97 => 'SECURITY BREACH'
-        );
+            97 => 'SECURITY BREACH',
+        ];
 
         $message = 'PENDING';
 
@@ -123,11 +162,15 @@ public function getMessage()
      */
     public function getTransactionReference()
     {
-        $attributes = $this->data->attributes();
+        if ($this->data instanceof \SimpleXMLElement) {
+            $attributes = $this->data->attributes();
 
-        if (isset($attributes['orderCode'])) {
-            return $attributes['orderCode'];
+            if (isset($attributes['orderCode'])) {
+                return (string)$attributes['orderCode'];
+            }
         }
+
+        return null;
     }
 
     /**
diff --git a/src/Omnipay/WorldPayXML/Message/VoidRequest.php b/src/Omnipay/WorldPayXML/Message/VoidRequest.php
new file mode 100644
index 0000000..1b08c05
--- /dev/null
+++ b/src/Omnipay/WorldPayXML/Message/VoidRequest.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Refund or cancel depending on current status.
+ */
+
+namespace Omnipay\WorldPayXML\Message;
+
+/**
+ * Omnipay WorldPay XML Refund or Cancel Request
+ */
+class VoidRequest extends ModifyRequest
+{
+
+    /**
+     * Retrieve the data for the request.
+     *
+     * @return \SimpleXMLElement
+     */
+    public function getData()
+    {
+        $data = $this->getBase();
+        $data->modify->orderModification->addChild('cancelOrRefund');
+
+        return $data;
+    }
+
+    /**
+     * Return a value to indicate the transaction type.
+     * @return integer
+     */
+    public function getTransactionType()
+    {
+        return static::VOID_REQUEST;
+    }
+}
diff --git a/tests/Omnipay/WorldPayXML/GatewayTest.php b/tests/Omnipay/WorldPayXML/GatewayTest.php
index 95980f1..7234c74 100755
--- a/tests/Omnipay/WorldPayXML/GatewayTest.php
+++ b/tests/Omnipay/WorldPayXML/GatewayTest.php
@@ -7,6 +7,12 @@
 
 class GatewayTest extends GatewayTestCase
 {
+    /**
+     * The WorldPayXML gateway
+     * @var \Omnipay\WorldPayXML\Gateway
+     */
+    public $gateway;
+
     public function setUp()
     {
         parent::setUp();
@@ -15,8 +21,32 @@ public function setUp()
             $this->getHttpClient(),
             $this->getHttpRequest()
         );
+    }
+
+    public function testGetName()
+    {
+        $this->assertEquals('WorldPayXML', $this->gateway->getName());
+    }
+
+    public function testGetShortName()
+    {
+        $this->assertEquals('WorldPayXML', $this->gateway->getShortName());
+    }
 
-        $this->options = array(
+    public function testGetDefaultParameters()
+    {
+        $defaultParameters = $this->gateway->getDefaultParameters();
+
+        $this->assertInternalType('array', $defaultParameters);
+        $this->assertArrayHasKey('installation', $defaultParameters);
+        $this->assertArrayHasKey('merchant', $defaultParameters);
+        $this->assertArrayHasKey('password', $defaultParameters);
+        $this->assertArrayHasKey('testMode', $defaultParameters);
+    }
+
+    public function testPurchaseSuccess()
+    {
+        $options = array(
             'amount' => '10.00',
             'card' => new CreditCard(
                 array(
@@ -30,13 +60,10 @@ public function setUp()
             ),
             'transactionId' => 'T0211010',
         );
-    }
 
-    public function testPurchaseSuccess()
-    {
         $this->setMockHttpResponse('PurchaseSuccess.txt');
 
-        $response = $this->gateway->purchase($this->options)->send();
+        $response = $this->gateway->purchase($options)->send();
 
         $this->assertTrue($response->isSuccessful());
         $this->assertEquals('T0211010', $response->getTransactionReference());
@@ -44,11 +71,210 @@ public function testPurchaseSuccess()
 
     public function testPurchaseError()
     {
+        $options = array(
+            'amount' => '10.00',
+            'card' => new CreditCard(
+                array(
+                    'firstName' => 'Example',
+                    'lastName' => 'User',
+                    'number' => '4111111111111111',
+                    'expiryMonth' => '12',
+                    'expiryYear' => '2016',
+                    'cvv' => '123',
+                )
+            ),
+            'transactionId' => 'T0211010',
+        );
+
         $this->setMockHttpResponse('PurchaseFailure.txt');
 
-        $response = $this->gateway->purchase($this->options)->send();
+        $response = $this->gateway->purchase($options)->send();
 
         $this->assertFalse($response->isSuccessful());
         $this->assertSame('CARD EXPIRED', $response->getMessage());
     }
+
+    public function testAuthorisationSuccess()
+    {
+        $this->setMockHttpResponse('AuthorisationSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'authorisationCode' => 'abc123',
+        ];
+
+        $response = $this->gateway->authorise($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testBackOfficeCodeSuccess()
+    {
+        $this->setMockHttpResponse('BackOfficeCodeSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'backOfficeCode' => 'abc123',
+        ];
+
+        $response = $this->gateway->backOfficeCode($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testCancelSuccess()
+    {
+        $this->setMockHttpResponse('CancelSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+        ];
+
+        $response = $this->gateway->cancel($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testCaptureSuccess()
+    {
+        $this->setMockHttpResponse('CaptureSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'currencyCode' => 'EUR',
+            'debitCreditIndicator' => 'credit',
+        ];
+
+        $response = $this->gateway->capture($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testCaptureFailure()
+    {
+        $this->setMockHttpResponse('CaptureFailure.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'currencyCode' => 'EUR',
+            'debitCreditIndicator' => 'credit',
+        ];
+
+        $response = $this->gateway->capture($options)->send();
+
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testIncreasAuthorisationSuccess()
+    {
+        $this->setMockHttpResponse('IncreaseAuthorisationSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'currencyCode' => 'EUR',
+            'debitCreditIndicator' => 'credit',
+        ];
+
+        $response = $this->gateway->increaseAuthorisation($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testIncreaseAuthorisationFailure()
+    {
+        $this->setMockHttpResponse('IncreaseAuthorisationFailure.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'currencyCode' => 'EUR',
+            'debitCreditIndicator' => 'credit',
+        ];
+
+        $response = $this->gateway->increaseAuthorisation($options)->send();
+
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testInquirySuccess()
+    {
+        $this->setMockHttpResponse('InquirySuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+        ];
+
+        $response = $this->gateway->inquiry($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testInquiryFailure()
+    {
+        $this->setMockHttpResponse('InquiryFailure.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+        ];
+
+        $response = $this->gateway->inquiry($options)->send();
+
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testRefundSuccess()
+    {
+        $this->setMockHttpResponse('RefundSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'amountCurrencyCode' => 'GBP',
+            'debitOrCredit' => 'credit',
+        ];
+
+        $response = $this->gateway->void($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
+
+    public function testRefundFailure()
+    {
+        $this->setMockHttpResponse('RefundFailure.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+            'amount' => 12.34,
+            'amountCurrencyCode' => 'GBP',
+            'debitOrCredit' => 'xxxxx',
+        ];
+
+        $response = $this->gateway->void($options)->send();
+
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testVoidSuccess()
+    {
+        $this->setMockHttpResponse('VoidSuccess.txt');
+
+        $options = [
+            'orderCode' => 'T0211010',
+        ];
+
+        $response = $this->gateway->void($options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+    }
 }
diff --git a/tests/Omnipay/WorldPayXML/Message/ResponseTest.php b/tests/Omnipay/WorldPayXML/Message/ResponseTest.php
index 3e98db8..cab8d98 100755
--- a/tests/Omnipay/WorldPayXML/Message/ResponseTest.php
+++ b/tests/Omnipay/WorldPayXML/Message/ResponseTest.php
@@ -3,21 +3,186 @@
 namespace Omnipay\WorldPayXML\Message;
 
 use Omnipay\Tests\TestCase;
+use Mockery;
 
 class ResponseTest extends TestCase
 {
     /**
-     * @expectedException Omnipay\Common\Exception\InvalidResponseException
+     * @expectedException \Omnipay\Common\Exception\InvalidResponseException
      */
     public function testConstructEmpty()
     {
-        $response = new Response($this->getMockRequest(), '');
+        $response = Response::make($this->getMockRequest(), '');
+    }
+
+    public function testAuthorisationSuccess()
+    {
+        $authorisationRequest = Mockery::mock('Omnipay\WorldPayXML\Message\AuthorisationRequest');
+        $httpResponse = $this->getMockHttpResponse('AuthorisationSuccess.txt');
+        $response = Response::make(
+            $authorisationRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testBackOfficeCodeSuccess()
+    {
+        $backOfficeCodeRequest = Mockery::mock('Omnipay\WorldPayXML\Message\BackOfficeCodeRequest');
+        $httpResponse = $this->getMockHttpResponse('BackOfficeCodeSuccess.txt');
+        $response = Response::make(
+            $backOfficeCodeRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testCancelSuccess()
+    {
+        $cancelRequest = Mockery::mock('Omnipay\WorldPayXML\Message\CancelRequest');
+        $httpResponse = $this->getMockHttpResponse('CancelSuccess.txt');
+        $response = Response::make(
+            $cancelRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testCaptureSuccess()
+    {
+        $captureRequest = Mockery::mock('Omnipay\WorldPayXML\Message\CaptureRequest');
+        $httpResponse = $this->getMockHttpResponse('CaptureSuccess.txt');
+        $response = Response::make(
+            $captureRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testCaptureFailure()
+    {
+        $captureRequest = Mockery::mock('Omnipay\WorldPayXML\Message\CaptureRequest');
+        $httpResponse = $this->getMockHttpResponse('CaptureFailure.txt');
+        $response = Response::make(
+            $captureRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertEquals('Attribute "debitCreditIndicator" with value "xxxx" must have a value from the list "debit credit ".', $response->getMessage());
+    }
+
+    public function testInquirySuccess()
+    {
+        $inquiryRequest = Mockery::mock('Omnipay\WorldPayXML\Message\InquiryRequest');
+        $httpResponse = $this->getMockHttpResponse('InquirySuccess.txt');
+        $response = Response::make(
+            $inquiryRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('AUTHORISED', $response->getMessage());
+    }
+
+    public function testInquiryFailure()
+    {
+        $inquiryRequest = Mockery::mock('Omnipay\WorldPayXML\Message\InquiryRequest');
+        $httpResponse = $this->getMockHttpResponse('InquiryFailure.txt');
+        $response = Response::make(
+            $inquiryRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testRefundSuccess()
+    {
+        $refundRequest = Mockery::mock('Omnipay\WorldPayXML\Message\RefundRequest');
+        $httpResponse = $this->getMockHttpResponse('RefundSuccess.txt');
+        $response = Response::make(
+            $refundRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testRefundFailure()
+    {
+        $refundRequest = Mockery::mock('Omnipay\WorldPayXML\Message\RefundRequest');
+        $httpResponse = $this->getMockHttpResponse('RefundFailure.txt');
+        $response = Response::make(
+            $refundRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertEquals('Attribute "debitCreditIndicator" with value "xxxx" must have a value from the list "debit credit ".', $response->getMessage());
+    }
+
+    public function testVoidSuccess()
+    {
+        $voidRequest = Mockery::mock('Omnipay\WorldPayXML\Message\VoidRequest');
+        $httpResponse = $this->getMockHttpResponse('RefundSuccess.txt');
+        $response = Response::make(
+            $voidRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('SUCCESS', $response->getMessage());
+    }
+
+    public function testIncreaseAuthorisationSuccess()
+    {
+        $increaseAuthorisationRequest = Mockery::mock('Omnipay\WorldPayXML\Message\IncreaseAuthorisationRequest');
+        $httpResponse = $this->getMockHttpResponse('IncreaseAuthorisationSuccess.txt');
+        $response = Response::make(
+            $increaseAuthorisationRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('AUTHORISED', $response->getMessage());
+    }
+
+    public function testIncreaseAuthorisationFail()
+    {
+        $increaseAuthorisationRequest = Mockery::mock('Omnipay\WorldPayXML\Message\IncreaseAuthorisationRequest');
+        $httpResponse = $this->getMockHttpResponse('IncreaseAuthorisationFailure.txt');
+        $response = Response::make(
+            $increaseAuthorisationRequest,
+            $httpResponse->getBody()
+        );
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('ERROR: Could not find order', $response->getMessage());
     }
 
     public function testPurchaseSuccess()
     {
         $httpResponse = $this->getMockHttpResponse('PurchaseSuccess.txt');
-        $response = new Response(
+        $response = Response::make(
             $this->getMockRequest(),
             $httpResponse->getBody()
         );
@@ -31,7 +196,7 @@ public function testPurchaseSuccess()
     public function testPurchaseFailure()
     {
         $httpResponse = $this->getMockHttpResponse('PurchaseFailure.txt');
-        $response = new Response(
+        $response = Response::make(
             $this->getMockRequest(),
             $httpResponse->getBody()
         );
@@ -41,4 +206,18 @@ public function testPurchaseFailure()
         $this->assertEquals('T0211234', $response->getTransactionReference());
         $this->assertSame('CARD EXPIRED', $response->getMessage());
     }
+
+    public function testPurchaseReferral()
+    {
+        $httpResponse = $this->getMockHttpResponse('PurchaseReferral.txt');
+        $response = Response::make(
+            $this->getMockRequest(),
+            $httpResponse->getBody()
+        );
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertTrue($response->isRedirect());
+        $this->assertEquals('T0211010', $response->getTransactionReference());
+        $this->assertEquals('PENDING', $response->getMessage());
+    }
 }
diff --git a/tests/Omnipay/WorldPayXML/Mock/AuthorisationSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/AuthorisationSuccess.txt
new file mode 100755
index 0000000..4700538
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/AuthorisationSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><authorisationCodeReceived orderCode="T0211010" authorisationCode="acbsdf"/></ok></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/BackOfficeCodeSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/BackOfficeCodeSuccess.txt
new file mode 100755
index 0000000..9e09012
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/BackOfficeCodeSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><backofficeCodeReceived orderCode="T0211010" backOfficeCode="CAP1234"/></ok></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/CancelSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/CancelSuccess.txt
new file mode 100755
index 0000000..1553ebd
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/CancelSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><cancelReceived orderCode="T0211010"/></ok></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/CaptureFailure.txt b/tests/Omnipay/WorldPayXML/Mock/CaptureFailure.txt
new file mode 100644
index 0000000..fc58e4b
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/CaptureFailure.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4" merchantCode="MYMERCHANT"><reply><error code="2"><![CDATA[Attribute "debitCreditIndicator" with value "xxxx" must have a value from the list "debit credit ".]]></error></reply></paymentService>
diff --git a/tests/Omnipay/WorldPayXML/Mock/CaptureSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/CaptureSuccess.txt
new file mode 100755
index 0000000..f28f1bd
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/CaptureSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><captureReceived orderCode="T0211010"><amount value="4000" currencyCode="EUR" exponent="2" debitCreditIndicator="credit"/></captureReceived></ok></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationFailure.txt b/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationFailure.txt
new file mode 100755
index 0000000..691d7ea
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationFailure.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 649
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4" merchantCode="MYMERCHANT"><reply><orderStatus orderCode="T0211010"><error code="5"><![CDATA[Could not find order]]></error></orderStatus></reply></paymentService>
diff --git a/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationSuccess.txt
new file mode 100755
index 0000000..86b0c18
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/IncreaseAuthorisationSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><orderStatus orderCode="T0211010"><payment><paymentMethod>VISA-SSL</paymentMethod><amount value="1400" currencyCode="GBP" exponent="2" debitCreditIndicator="credit"/> <lastEvent>AUTHORISED</lastEvent><CVCResultCode description="APPROVED"/><balance accountType="IN_PROCESS_AUTHORISED"><amount value="1400" currencyCode="GBP" exponent="2" debitCreditIndicator="credit"/></balance> <cardNumber>4444********1111</cardNumber><riskScore value="0"/></payment></orderStatus></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/InquiryFailure.txt b/tests/Omnipay/WorldPayXML/Mock/InquiryFailure.txt
new file mode 100755
index 0000000..042e856
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/InquiryFailure.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 649
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4" merchantCode="MYMERCHANT"><reply><orderStatus orderCode="T0211010"><error code="5"><![CDATA[Could not find payment for order]]></error></orderStatus></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/InquirySuccess.txt b/tests/Omnipay/WorldPayXML/Mock/InquirySuccess.txt
new file mode 100755
index 0000000..dd4e7af
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/InquirySuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><orderStatus orderCode="T0211010"><payment><paymentMethod>VISA-SSL</paymentMethod><amount value="1400" currencyCode="GBP" exponent="2" debitCreditIndicator="credit"/> <lastEvent>AUTHORISED</lastEvent><CVCResultCode description="APPROVED"/><balance accountType="IN_PROCESS_AUTHORISED"><amount value="1400" currencyCode="GBP" exponent="2" debitCreditIndicator="credit"/></balance> <cardNumber>4444********1111</cardNumber><riskScore value="0"/></payment><date/></orderStatus></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/PurchaseReferral.txt b/tests/Omnipay/WorldPayXML/Mock/PurchaseReferral.txt
new file mode 100644
index 0000000..62124c1
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/PurchaseReferral.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4" merchantCode="MYMERCHANT"><reply><orderStatus orderCode='T0211010'><requestInfo><request3DSecure><paRequest>eJxVUm1vgjAQ/ivEzxu1UBDNWYMj2UzGZjb3AxpolERebMtw+/W7Koi79MPdc69P72B1Lo/Ot1S6qKvlhLrTibPisDsoKZNPmbVKckil1mIvnSLHCMbmHr6IhUE04bCNP+SJQ1+BYwHXAzKYmKqyg6gMB5Gd1ps3TkcB0mNQSrVJ7l1WHse4qx8aoXVXq5xTz2dBOIuA3CCoRCn5rq6P2giDvZ1XkwO5oJDVbWXUD4+8EMhgQKuO/GBMsyCk6zrXjLluVpdArB/IyGDbWk1jvXOR8/Q3nqbJ12+6i710H9/LEoiNgFwYyb0pDag3ZQ6dLShbMAbkgoMo7SD8eb11qPfgI94j0NhG8dWwVJHmHQK4FCWrbKAzWCDPTV1JjMAF3HTIpc74u8qlchJUVdFYhjiExYGMpJ5e7JIygz8dzoJ5yOZYn/kRC3y7qYvD9ijw72hIr02sAcSmkv4SSH8tqP27oj+BIsbE</paRequest><issuerURL><![CDATA[https://secure-test.streamline-esolutions.com/jsp/test/shopper/ThreeDResponseSimulator.jsp]]></issuerURL></request3DSecure></requestInfo><echoData>111068086332802</echoData></orderStatus></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/RefundFailure.txt b/tests/Omnipay/WorldPayXML/Mock/RefundFailure.txt
new file mode 100755
index 0000000..fc58e4b
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/RefundFailure.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4" merchantCode="MYMERCHANT"><reply><error code="2"><![CDATA[Attribute "debitCreditIndicator" with value "xxxx" must have a value from the list "debit credit ".]]></error></reply></paymentService>
diff --git a/tests/Omnipay/WorldPayXML/Mock/RefundSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/RefundSuccess.txt
new file mode 100755
index 0000000..cf7b07b
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/RefundSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><refundReceived orderCode="T0211010"><amount value="4000" currencyCode="EUR" exponent="2" debitCreditIndicator="credit"/></refundReceived></ok></reply></paymentService>
\ No newline at end of file
diff --git a/tests/Omnipay/WorldPayXML/Mock/VoidSuccess.txt b/tests/Omnipay/WorldPayXML/Mock/VoidSuccess.txt
new file mode 100755
index 0000000..63a845b
--- /dev/null
+++ b/tests/Omnipay/WorldPayXML/Mock/VoidSuccess.txt
@@ -0,0 +1,11 @@
+HTTP/1.1 200 OK
+Connection: close
+Server: VPS-3.033.00
+Date: Sat, 23 Feb 2013 05:17:32 GMT
+Content-type: text/xml
+Content-length: 758
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE paymentService PUBLIC "-//WorldPay//DTD WorldPay PaymentService v1//EN"
+                                "http://dtd.worldpay.com/paymentService_v1.dtd">
+<paymentService version="1.4.1" merchantCode="MYMERCHANT"><reply><ok><voidReceived orderCode="T0211010"></voidReceived></ok></reply></paymentService>
\ No newline at end of file