diff --git a/src/Gateway.php b/src/Gateway.php
index f82e988..aed2aea 100644
--- a/src/Gateway.php
+++ b/src/Gateway.php
@@ -22,7 +22,7 @@ public function getDefaultParameters()
         return [
             'merchantKey' => '',
             'merchantCode' => '',
-            'backendUrl' => ''
+            'backendUrl' => '',
         ];
     }
 
@@ -66,4 +66,4 @@ public function completePurchase(array $parameters = array())
         return $this->createRequest('\Omnipay\IPay88\Message\CompletePurchaseRequest', $parameters);
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
index ce41efd..715e1bc 100644
--- a/src/Message/AbstractRequest.php
+++ b/src/Message/AbstractRequest.php
@@ -49,15 +49,15 @@ protected function guardParameters()
 
     protected function createSignatureFromString($fullStringToHash)
     {
-        return base64_encode($this->hex2bin(sha1($fullStringToHash)));
-    }
-
-    private function hex2bin($hexSource)
-    {
-        $bin = '';
-        for ($i = 0; $i < strlen($hexSource); $i = $i + 2) {
-            $bin .= chr(hexdec(substr($hexSource, $i, 2)));
-        }
-        return $bin;
-    }
-}
\ No newline at end of file
+        return hash('sha256', $fullStringToHash);
+    }
+
+    // private function hex2bin($hexSource)
+    // {
+    //     $bin = '';
+    //     for ($i = 0; $i < strlen($hexSource); $i = $i + 2) {
+    //         $bin .= chr(hexdec(substr($hexSource, $i, 2)));
+    //     }
+    //     return $bin;
+    // }
+}
diff --git a/src/Message/CompletePurchaseRequest.php b/src/Message/CompletePurchaseRequest.php
index fe510dc..771835e 100644
--- a/src/Message/CompletePurchaseRequest.php
+++ b/src/Message/CompletePurchaseRequest.php
@@ -2,12 +2,9 @@
 
 namespace Omnipay\IPay88\Message;
 
-
-use Omnipay\Common\Currency;
-
 class CompletePurchaseRequest extends AbstractRequest
 {
-    protected $endpoint = 'https://www.mobile88.com/epayment/enquiry.asp';
+    protected $endpoint = 'https://payment.ipay88.com.my/epayment/entry.asp';
 
     public function getData()
     {
@@ -31,11 +28,11 @@ public function getData()
     public function sendData($data)
     {
         $data['ReQueryStatus'] = $this->httpClient
-            ->request('post', $this->endpoint.'?'.http_build_query([
+            ->request('post', $this->endpoint . '?' . http_build_query([
                 'MerchantCode' => $this->getMerchantCode(),
                 'RefNo' => $data['RefNo'],
-                'Amount' => $data['Amount']
-                ]), [], json_encode([]))
+                'Amount' => $data['Amount'],
+            ]), [], json_encode([]))
             ->getBody()
             ->getContents();
 
diff --git a/src/Message/PurchaseRequest.php b/src/Message/PurchaseRequest.php
index 3281c2a..5c9f869 100644
--- a/src/Message/PurchaseRequest.php
+++ b/src/Message/PurchaseRequest.php
@@ -2,7 +2,6 @@
 
 namespace Omnipay\IPay88\Message;
 
-
 class PurchaseRequest extends AbstractRequest
 {
     public function getData()
@@ -21,6 +20,7 @@ public function getData()
             'UserContact' => $this->getCard()->getNumber(),
             'Remark' => '',
             'Lang' => '',
+            'SignatureType' => 'SHA256',
             'Signature' => $this->signature(
                 $this->getMerchantKey(),
                 $this->getMerchantCode(),
@@ -47,4 +47,4 @@ private function signature($merchantKey, $merchantCode, $refNo, $amount, $curren
         return $this->createSignatureFromString(implode('', $paramsInArray));
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/Message/PurchaseResponse.php b/src/Message/PurchaseResponse.php
index 3321bfe..f8c6659 100644
--- a/src/Message/PurchaseResponse.php
+++ b/src/Message/PurchaseResponse.php
@@ -2,12 +2,11 @@
 
 namespace Omnipay\IPay88\Message;
 
-
 use Omnipay\Common\Message\AbstractResponse;
 
 class PurchaseResponse extends AbstractResponse
 {
-    protected $endpoint = 'https://www.mobile88.com/ePayment/entry.asp';
+    protected $endpoint = 'https://payment.ipay88.com.my/epayment/entry.asp';
 
     public function getTransactionId()
     {
@@ -44,4 +43,4 @@ public function getRedirectData()
         return $this->data;
     }
 
-}
\ No newline at end of file
+}