diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index b6aa6eb9..a89ff1e2 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## [0.16.0] - 2023-11-20
+### New Features
+- **Asseco** - #167 3D form verisine `callbackUrl`eklendi.
+  Order verisinde yer alan **fail_url** callbackUrl'a atanmakdadır.
+
 ## [0.15.0] - 2023-10-03
 ### New Features
 - **GarantiPos** - `sha512` hashleme desteği eklendi.
diff --git a/examples/_main_config.php b/examples/_main_config.php
index 1d4b36bc..cf0f5dee 100644
--- a/examples/_main_config.php
+++ b/examples/_main_config.php
@@ -19,18 +19,20 @@
 $hostUrl = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http')."://$_SERVER[HTTP_HOST]";
 $subMenu = [];
 
+$handler = new \Monolog\Handler\StreamHandler(__DIR__.'/../var/log/pos.log', \Psr\Log\LogLevel::DEBUG);
+$logger = new \Monolog\Logger('pos', [$handler]);
+
 function getGateway(\Mews\Pos\Entity\Account\AbstractPosAccount $account): ?\Mews\Pos\PosInterface
 {
     try {
-        $handler = new \Monolog\Handler\StreamHandler(__DIR__.'/../var/log/pos.log', \Psr\Log\LogLevel::DEBUG);
-        $logger = new \Monolog\Logger('pos', [$handler]);
-
 /*        $client = new HttpClient(
             new \Http\Client\Curl\Client(),
             new \Slim\Psr7\Factory\RequestFactory(),
             new \Slim\Psr7\Factory\StreamFactory()
         );*/
 
+        global $logger;
+
         $pos = \Mews\Pos\Factory\PosFactory::createPosGateway($account, null, null, $logger);
         $pos->setTestMode(true);
 
diff --git a/examples/_templates/_payment_response.php b/examples/_templates/_payment_response.php
index dfb8126f..c2728800 100644
--- a/examples/_templates/_payment_response.php
+++ b/examples/_templates/_payment_response.php
@@ -7,6 +7,20 @@
 require_once '_config.php';
 require '../../_templates/_header.php';
 
+if ($pos instanceof \Mews\Pos\Gateways\EstV3Pos || $pos instanceof \Mews\Pos\Gateways\EstPos) {
+    /**
+     * Asseco'da callbackUrl == failUrl olarak tanimlidir.
+     * Eger kullanici 3D Auth sayfasinda islemini tamamlamadan tarayci sekmesini kapatirsa
+     * Asseco callbackUrl'a (yani failUrl'a) istek gonderir: https://github.com/mewebstudio/pos/issues/165
+     */
+    $logger->info('payment response', [
+        'method'       => $request->getMethod(),
+        'data_query'   => $request->query->all(),
+        'data_request' => $request->request->all(),
+    ]);
+}
+
+
 if (($request->getMethod() !== 'POST' && AbstractGateway::TX_POST_PAY !== $transaction)
     // PayFlex-CP GET request ile cevapliyor
     && ($request->getMethod() === 'GET' && [] === $request->query->all())
diff --git a/src/Crypt/EstPosCrypt.php b/src/Crypt/EstPosCrypt.php
index 0ef2e325..d462bcd2 100644
--- a/src/Crypt/EstPosCrypt.php
+++ b/src/Crypt/EstPosCrypt.php
@@ -23,6 +23,7 @@ public function create3DHash(AbstractPosAccount $account, array $requestData, ?s
             $txType,
             $requestData['installment'],
             $requestData['rand'],
+            $requestData['fail_url'], // callbackUrl
             $account->getStoreKey(),
         ];
 
diff --git a/src/DataMapper/EstPosRequestDataMapper.php b/src/DataMapper/EstPosRequestDataMapper.php
index 24c3fd75..130809d6 100644
--- a/src/DataMapper/EstPosRequestDataMapper.php
+++ b/src/DataMapper/EstPosRequestDataMapper.php
@@ -268,6 +268,8 @@ public function create3DFormDataCommon(AbstractPosAccount $account, $order, stri
             'oid'       => $order->id,
             'okUrl'     => $order->success_url,
             'failUrl'   => $order->fail_url,
+            // musteri 3D onay sayfasinda islemleri tamamlamadan kapatirsa, banka bu sayfaya bir istek gonderecek.
+            'callbackUrl' => $order->fail_url,
             'rnd'       => $order->rand,
             'lang'      => $this->getLang($account, $order),
             'currency'  => $this->mapCurrency($order->currency),
diff --git a/tests/Crypt/EstPosCryptTest.php b/tests/Crypt/EstPosCryptTest.php
index dea6c084..59abfde4 100644
--- a/tests/Crypt/EstPosCryptTest.php
+++ b/tests/Crypt/EstPosCryptTest.php
@@ -53,7 +53,7 @@ public function testCreate3DHash()
             'fail_url'    => 'https://domain.com/fail_url',
             'rand'        => 'rand',
         ];
-        $expected = 'S7UxUAohxaxzl35WxHyDfuQx0sg=';
+        $expected = 'TN+2/D8lijFd+5zAUar6SH6EiRY=';
 
         $actual = $this->crypt->create3DHash($this->threeDAccount, $order, 'Auth');
         $this->assertEquals($expected, $actual);
@@ -73,7 +73,7 @@ public function testCreate3DHashFor3DPay()
             'fail_url' => 'https://domain.com/fail_url',
             'rand' => 'rand',
         ];
-        $expected = 'S7UxUAohxaxzl35WxHyDfuQx0sg=';
+        $expected = 'TN+2/D8lijFd+5zAUar6SH6EiRY=';
 
         $actual = $this->crypt->create3DHash($this->threeDAccount, $requestData, 'Auth');
         $this->assertEquals($expected, $actual);
diff --git a/tests/DataMapper/EstPosRequestDataMapperTest.php b/tests/DataMapper/EstPosRequestDataMapperTest.php
index 7adf1350..06c4da8a 100644
--- a/tests/DataMapper/EstPosRequestDataMapperTest.php
+++ b/tests/DataMapper/EstPosRequestDataMapperTest.php
@@ -33,7 +33,7 @@ class EstPosRequestDataMapperTest extends TestCase
     private $requestDataMapper;
 
     private $order;
-    
+
     private $config;
 
     protected function setUp(): void
@@ -67,7 +67,7 @@ protected function setUp(): void
 
         $this->pos = PosFactory::createPosGateway($this->threeDAccount);
         $this->pos->setTestMode(true);
-        
+
         $this->requestDataMapper = new EstPosRequestDataMapper(PosFactory::getGatewayCrypt(EstPos::class, new NullLogger()));
         $this->card              = CreditCardFactory::create($this->pos, '5555444433332222', '22', '01', '123', 'ahmet', AbstractCreditCard::CARD_TYPE_VISA);
     }
@@ -314,13 +314,14 @@ public function testGet3DFormData()
         $inputs = [
             'clientid'  => $account->getClientId(),
             'storetype' => $account->getModel(),
-            'hash'      => 'S7UxUAohxaxzl35WxHyDfuQx0sg=',
+            'hash'      => 'TN+2/D8lijFd+5zAUar6SH6EiRY=',
             'firmaadi'  => $this->order['name'],
             'Email'     => $this->order['email'],
             'amount'    => $this->order['amount'],
             'oid'       => $this->order['id'],
             'okUrl'     => $this->order['success_url'],
             'failUrl'   => $this->order['fail_url'],
+            'callbackUrl' => $this->order['fail_url'],
             'rnd'       => $this->order['rand'],
             'lang'      => 'tr',
             'currency'  => 949,
@@ -393,18 +394,19 @@ public function testGet3DHostFormData()
         $pos = PosFactory::createPosGateway($account);
         $pos->setTestMode(true);
         $pos->prepare($this->order, AbstractGateway::TX_PAY);
-        
+
         $gatewayURL = $this->config['banks'][$this->threeDAccount->getBank()]['urls']['gateway_3d_host']['test'];
         $inputs     = [
             'clientid'  => $account->getClientId(),
             'storetype' => $account->getModel(),
-            'hash'      => 'zQJGquP0/PXt6LeutjN1Qxq32Zg=',
+            'hash'      => '4VS4GWS81j6YJWAuvJ0yEXvCsJM=',
             'firmaadi'  => $this->order['name'],
             'Email'     => $this->order['email'],
             'amount'    => $this->order['amount'],
             'oid'       => $this->order['id'],
             'okUrl'     => $this->order['success_url'],
             'failUrl'   => $this->order['fail_url'],
+            'callbackUrl' => $this->order['fail_url'],
             'rnd'       => $this->order['rand'],
             'lang'      => 'tr',
             'currency'  => '949',
@@ -522,6 +524,7 @@ public static function threeDFormDataProvider(): iterable
                     'oid'                             => 'order222',
                     'okUrl'                           => 'https://domain.com/success',
                     'failUrl'                         => 'https://domain.com/fail_url',
+                    'callbackUrl'                     => 'https://domain.com/fail_url',
                     'rnd'                             => 'rand',
                     'lang'                            => 'tr',
                     'currency'                        => '949',
@@ -534,7 +537,7 @@ public static function threeDFormDataProvider(): iterable
                     'Ecom_Payment_Card_ExpDate_Month' => '01',
                     'Ecom_Payment_Card_ExpDate_Year'  => '22',
                     'cv2'                             => '123',
-                    'hash'                            => 'S7UxUAohxaxzl35WxHyDfuQx0sg=',
+                    'hash'                            => 'TN+2/D8lijFd+5zAUar6SH6EiRY=',
                 ],
             ],
         ];
@@ -563,6 +566,7 @@ public static function threeDFormDataProvider(): iterable
                     'oid'                             => 'order222',
                     'okUrl'                           => 'https://domain.com/success',
                     'failUrl'                         => 'https://domain.com/fail_url',
+                    'callbackUrl'                     => 'https://domain.com/fail_url',
                     'rnd'                             => 'rand',
                     'lang'                            => 'tr',
                     'currency'                        => '949',
@@ -577,7 +581,7 @@ public static function threeDFormDataProvider(): iterable
                     'cv2'                             => '123',
                     'IMCKOD'                          => 'İmece Ürün Bilgisi',
                     'FDONEM'                          => 'Faizsiz Dönem Bilgisi',
-                    'hash'                            => 'S7UxUAohxaxzl35WxHyDfuQx0sg=',
+                    'hash'                            => 'TN+2/D8lijFd+5zAUar6SH6EiRY=',
                 ],
             ],
         ];
diff --git a/tests/DataMapper/EstV3PosRequestDataMapperTest.php b/tests/DataMapper/EstV3PosRequestDataMapperTest.php
index 8026b831..22168d8f 100644
--- a/tests/DataMapper/EstV3PosRequestDataMapperTest.php
+++ b/tests/DataMapper/EstV3PosRequestDataMapperTest.php
@@ -61,7 +61,7 @@ protected function setUp(): void
             'success_url' => 'https://domain.com/success',
             'fail_url'    => 'https://domain.com/fail_url',
             'lang'        => 'tr',
-            'rand'        => microtime(),
+            'rand'        => 'rand-21212',
         ];
 
         $this->pos = PosFactory::createPosGateway($this->threeDAccount);
@@ -92,6 +92,7 @@ public function testGet3DFormData()
             'oid'           => $this->order['id'],
             'okUrl'         => $this->order['success_url'],
             'failUrl'       => $this->order['fail_url'],
+            'callbackUrl'   => $this->order['fail_url'],
             'rnd'           => $this->order['rand'],
             'hashAlgorithm' => 'ver3',
             'lang'          => 'tr',
@@ -100,7 +101,7 @@ public function testGet3DFormData()
             'taksit'        => '',
         ];
 
-        $hash           = $this->requestDataMapper->getCrypt()->create3DHash($account, $inputs, $txType);
+        $hash           = '7MGmDH2CY9jlFd4kVHwdvlyt07hIqkiBWVR8bkjAiaaRhK2XUHyvrDLqv0vlG6YY8bXChDkLfnDwVLi3Pvg5lQ==';
         $inputs['hash'] = $hash;
         $form           = [
             'gateway' => $gatewayURL,
@@ -123,7 +124,7 @@ public function testGet3DFormData()
         $form['inputs']['cv2']                             = $card->getCvv();
 
         unset($form['inputs']['hash']);
-        $form['inputs']['hash'] = $this->requestDataMapper->getCrypt()->create3DHash($account, $form['inputs'], $txType);
+        $form['inputs']['hash'] = '7EgK2aMhS848ZMEkl2d0s1dFXlMhCy4LS5FFk+k/FbEmmVqBqx6TtQ1Yg7aW0KQa/5hrQODwBVT3SCUwfXHEsg==';
 
         $this->assertEquals($form, $this->requestDataMapper->create3DFormData(
             $this->pos->getAccount(),
@@ -163,6 +164,7 @@ public function testGet3DHostFormData()
             'oid'       => $this->order['id'],
             'okUrl'     => $this->order['success_url'],
             'failUrl'   => $this->order['fail_url'],
+            'callbackUrl' => $this->order['fail_url'],
             'rnd'       => $this->order['rand'],
             'hashAlgorithm' => 'ver3',
             'lang'      => 'tr',
@@ -175,7 +177,8 @@ public function testGet3DHostFormData()
             'method'  => 'POST',
             'inputs'  => $inputs,
         ];
-        $form['inputs']['hash']       = $this->requestDataMapper->getCrypt()->create3DHash($account, $inputs, AbstractGateway::TX_PAY);
+
+        $form['inputs']['hash']       = 'pxvr9oG9G6v2AU/Lci3qs7OiBAwcvAaLotG5rorJVe31DJN/wlVDReWpqFSJojTLPs6pPiS1L1U+QkE0dJJBKw==';
 
         $this->assertEquals($form, $this->requestDataMapper->create3DFormData(
             $pos->getAccount(),