Add findCustomer method to Gateway

Author: Konstantinos Christofilos

src/Gateway.php

@@ -113,6 +113,15 @@ public function clientToken(array $parameters = array())
         return $this->createRequest('\Omnipay\Braintree\Message\ClientTokenRequest', $parameters);
     }
 
+    /**
+     * @param string $id
+     * @return Message\FindCustomerRequest
+     */
+    public function findCustomer($id)
+    {
+        return $this->createRequest('\Omnipay\Braintree\Message\FindCustomerRequest', ['customerId' => $id]);
+    }
+
     /**
      * @param array $parameters
      * @return Message\CreateCustomerRequest

src/Message/FindCustomerRequest.php

@@ -0,0 +1,28 @@
+<?php
+namespace Omnipay\Braintree\Message;
+
+/**
+ * Find Customer Request
+ *
+ * @method CustomerResponse send()
+ */
+class FindCustomerRequest extends AbstractRequest
+{
+    public function getData()
+    {
+        return $this->getCustomerData();
+    }
+
+    /**
+     * Send the request with specified data
+     *
+     * @param  mixed $data The data to send
+     * @return CustomerResponse
+     */
+    public function sendData($data)
+    {
+        $response = $this->braintree->customer()->find($this->getCustomerId());
+
+        return $this->response = new CustomerResponse($this, $response);
+    }
+}