diff --git a/src/Gateway.php b/src/Gateway.php
index dff28b8..7a995f1 100644
--- a/src/Gateway.php
+++ b/src/Gateway.php
@@ -5,7 +5,7 @@
 use Omnipay\Common\AbstractGateway;
 use Omnipay\Paystack\Message\CompletePurchaseRequest;
 use Omnipay\Paystack\Message\PurchaseRequest;
-use Omnipay\Paystack\Message\PurchaseResponse;
+use Omnipay\Paystack\Message\RefundRequest;
 
 /**
  * PayStack Gateway
@@ -81,4 +81,12 @@ public function completePurchase(array $parameters = [])
     {
         return $this->createRequest(CompletePurchaseRequest::class, $parameters);
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function refund(array $parameters = [])
+    {
+        return $this->createRequest(RefundRequest::class, $parameters);
+    }
 }
diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
index f3f14fb..7f7ceec 100644
--- a/src/Message/AbstractRequest.php
+++ b/src/Message/AbstractRequest.php
@@ -37,4 +37,13 @@ public function setSecretKey($value)
     {
         $this->setParameter('secret_key', $value);
     }
+
+    public function getRequestHeaders()
+    {
+        return [
+            'Authorization' => 'Bearer ' . $this->getSecretKey(),
+            'Content-Type' => 'application/json',
+            'Cache-Control' => 'no-cache'
+        ];
+    }
 }
diff --git a/src/Message/CompletePurchaseRequest.php b/src/Message/CompletePurchaseRequest.php
index 30e43b5..d6d5bf9 100644
--- a/src/Message/CompletePurchaseRequest.php
+++ b/src/Message/CompletePurchaseRequest.php
@@ -28,13 +28,7 @@ public function getData()
     public function sendData($data)
     {
         try {
-            $headers = [
-                'Authorization' => 'Bearer ' . $this->getSecretKey(),
-                'Content-Type' => 'application/json',
-                'Cache-Control' => 'no-cache'
-            ];
-
-            $response = $this->httpClient->request('GET', $this->getApiEndpoint(), $headers, json_encode($data));
+            $response = $this->httpClient->request('GET', $this->getApiEndpoint(), $this->getRequestHeaders(), json_encode($data));
             $responseData = json_decode((string)$response->getBody(), true);
         } catch (\Exception $e) {
             throw new InvalidRequestException($e->getMessage(), $e->getCode(), $e);
diff --git a/src/Message/PurchaseRequest.php b/src/Message/PurchaseRequest.php
index 9a2d765..367c909 100644
--- a/src/Message/PurchaseRequest.php
+++ b/src/Message/PurchaseRequest.php
@@ -23,14 +23,19 @@ public function getData()
 
         $amount = $this->getAmountInteger();
         $email = $this->getParameter('email');
-        $reference = $this->getTransactionReference();
 
-        return [
+        $data = [
             'amount' => $amount,
             'email' => $email,
             'callback_url' => $this->getReturnUrl(),
-            'reference' => $reference
+            'metadata' => $this->getParameter('metadata')
         ];
+
+        if ($reference = $this->getTransactionReference()) {
+            $data['reference'] = $reference;
+        }
+
+        return $data;
     }
 
     /**
@@ -39,13 +44,7 @@ public function getData()
     public function sendData($data)
     {
         try {
-            $headers = [
-                'Authorization' => 'Bearer ' . $this->getSecretKey(),
-                'Content-Type' => 'application/json',
-                'Cache-Control' => 'no-cache'
-            ];
-
-            $response = $this->httpClient->request('POST', $this->getApiEndpoint(), $headers, json_encode($data));
+            $response = $this->httpClient->request('POST', $this->getApiEndpoint(), $this->getRequestHeaders(), json_encode($data));
             $responseData = json_decode((string)$response->getBody(), true);
         } catch (\Exception $e) {
             throw new InvalidRequestException($e->getMessage(), $e->getCode(), $e);
diff --git a/src/Message/PurchaseResponse.php b/src/Message/PurchaseResponse.php
index d89a052..6ff11b3 100644
--- a/src/Message/PurchaseResponse.php
+++ b/src/Message/PurchaseResponse.php
@@ -7,7 +7,6 @@
 
 class PurchaseResponse extends AbstractResponse implements RedirectResponseInterface
 {
-
     public function isSuccessful()
     {
         return false;
diff --git a/src/Message/RefundRequest.php b/src/Message/RefundRequest.php
new file mode 100644
index 0000000..e48604d
--- /dev/null
+++ b/src/Message/RefundRequest.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Omnipay\Paystack\Message;
+
+use Omnipay\Common\Exception\InvalidRequestException;
+
+class RefundRequest extends AbstractRequest
+{
+    /**
+     * @inheritDoc
+     */
+    public function getApiEndpoint()
+    {
+        return $this->baseApiEndpoint . '/refund';
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getData()
+    {
+        $amount = $this->getAmountInteger();
+        $reference = $this->getTransactionReference();
+
+        $data = ['transaction' => $reference];
+
+        if ($amount) {
+            $data['amount'] = $amount;
+        }
+
+        return $data;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function sendData($data)
+    {
+        try {
+            $response = $this->httpClient->request('POST', $this->getApiEndpoint(), $this->getRequestHeaders(), json_encode($data));
+            $responseData = json_decode((string)$response->getBody(), true);
+        } catch (\Exception $e) {
+            throw new InvalidRequestException($e->getMessage(), $e->getCode(), $e);
+        }
+
+        return $this->response = new RefundResponse($this, $responseData);
+    }
+}
diff --git a/src/Message/RefundResponse.php b/src/Message/RefundResponse.php
new file mode 100644
index 0000000..5e8e1b9
--- /dev/null
+++ b/src/Message/RefundResponse.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Omnipay\Paystack\Message;
+
+use Omnipay\Common\Message\AbstractResponse;
+
+class RefundResponse extends AbstractResponse
+{
+
+    public function isSuccessful()
+    {
+        return false;
+    }
+
+    public function isRedirect()
+    {
+        return false;
+    }
+
+    public function getMessage()
+    {
+        if (isset($this->data['message']) && $message = $this->data['message']) {
+            return $message;
+        }
+
+        return '';
+    }
+
+    public function getCode()
+    {
+        if (isset($this->data['data']) && $data = $this->data['data']) {
+            return $data['access_code'];
+        }
+
+        return '';
+    }
+
+    public function getTransactionReference()
+    {
+        if (isset($this->data['data']) && $data = $this->data['data']) {
+            if(isset($data['transaction']) && $transaction = $data['transaction'])
+            {
+                return $transaction['id'];
+            }
+        }
+
+        return '';
+    }
+}
diff --git a/tests/GatewayTest.php b/tests/GatewayTest.php
index 365f356..04eb6d9 100644
--- a/tests/GatewayTest.php
+++ b/tests/GatewayTest.php
@@ -20,7 +20,7 @@ public function setUp()
         $this->gateway = new Gateway($this->getHttpClient(), $this->getHttpRequest());
 
         $this->options = [
-            'amount' => '100',
+            'amount' => '2500',
             'reference' => static::PURCHASE_REFERENCE
         ];
     }
@@ -30,8 +30,7 @@ public function testPurchase()
         $this->setMockHttpResponse('PurchaseSuccess.txt');
 
         $options = array_merge($this->options, [
-            'email' => 'email@email.com',
-            'reference' => static::PURCHASE_REFERENCE
+            'email' => 'email@email.com'
         ]);
 
         $response = $this->gateway->purchase($options)->send();