diff --git a/src/Controllers/Refund.php b/src/Controllers/Refund.php
index d21b7b6..107b02d 100644
--- a/src/Controllers/Refund.php
+++ b/src/Controllers/Refund.php
@@ -45,13 +45,17 @@ public function refundPayment($payload, $paymentType = 'web_cashier')
     /**
      * Get refund details.
      * @param String $merchantRefundId The unique refund transaction id provided by merchant
+     * @param string $paymentId
      * @return array
      * @throws ClientControllerException
      */
-    public function getRefundDetails($merchantRefundId)
+    public function getRefundDetails($merchantRefundId, $paymentId)
     {
+        $data = [
+            'paymentId' => $paymentId
+        ];
         $main = $this->MainInst;
-        $url = $main->GetConfig('API_URL') . $main->GetEndpoint('REFUND') . "/$merchantRefundId";
+        $url = $main->GetConfig('API_URL') . $main->GetEndpoint('REFUND') . "/$merchantRefundId" . '?' . http_build_query($data);
         $endpoint = '/v2' . $main->GetEndpoint('REFUND') . "/$merchantRefundId";
         $options = $this->HmacCallOpts('GET', $endpoint);
 
diff --git a/tests/PendingPaymentTest.php b/tests/PendingPaymentTest.php
index 13375d4..41d63ab 100644
--- a/tests/PendingPaymentTest.php
+++ b/tests/PendingPaymentTest.php
@@ -114,7 +114,8 @@ public function refund()
     public function refundDetails()
     {
         $merchantRefundId = $this->data['merchantRefundId'];
-        $resp = $this->client->refund->getRefundDetails($merchantRefundId);
+        $paymentId = $this->data['paymentId'];
+        $resp = $this->client->refund->getRefundDetails($merchantRefundId, $paymentId);
         $resultInfo = $resp['resultInfo'];
         $this->assertEquals('SUCCESS', $resultInfo['code']);
     }
diff --git a/tests/RefundTest.php b/tests/RefundTest.php
index c033a8f..22e2426 100644
--- a/tests/RefundTest.php
+++ b/tests/RefundTest.php
@@ -66,8 +66,8 @@ public function refund()
     public function refundDetails()
     {
         $merchantRefundId = $this->data['merchantRefundId'];
-        ;
-        $resp = $this->client->refund->getRefundDetails($merchantRefundId);
+        $paymentId = $this->data['paymentId'];
+        $resp = $this->client->refund->getRefundDetails($merchantRefundId, $paymentId);
         $resultInfo = $resp['resultInfo'];
         $this->assertEquals('SUCCESS', $resultInfo['code']);
     }