Adding capture option

Author: antonioperic

src/Gateway.php

@@ -56,4 +56,9 @@ public function completePurchase(array $parameters = array())
     {
         return $this->createRequest('\Omnipay\Netaxept\Message\CompletePurchaseRequest', $parameters);
     }
+
+    public function capture(array $parameters = array())
+    {
+        return $this->createRequest('\Omnipay\Netaxept\Message\CaptureRequest', $parameters);
+    }
 }

src/Message/CaptureRequest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Omnipay\Netaxept\Message;
+
+/**
+ * Netaxept Capture Request
+ *
+ * @author Antonio Peric-Mazar <antonio@locastic.com>
+ */
+class CaptureRequest extends PurchaseRequest
+{
+    public function getData()
+    {
+        $data = array();
+        $data['transactionAmount'] = $this->getAmountInteger();
+        $data['transactionId'] = $this->getTransactionId();
+        $data['merchantId'] = $this->getMerchantId();
+        $data['token'] = $this->getPassword();
+        $data['operation'] = 'CAPTURE';
+
+        return $data;
+    }
+
+    public function sendData($data)
+    {
+        $url = $this->getEndpoint().'/Netaxept/Process.aspx?';
+        $httpResponse = $this->httpClient->get($url.http_build_query($data))->send();
+
+        return $this->response = new Response($this, $httpResponse->xml());
+    }
+}