diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7bb45af..09e2f043 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,12 +4,17 @@
 
 # Changelog
 
-
 ## Latest version
 #### Enhancements:
+- HPP Exemption Optimization Service
+- Update timestamp on the Logger
+
+## v4.0.0 (06/07/2022)
+#### Enhancements:
 - GP-ECOM: Add payment scheduler 
 - GP-ECOM/GP-API: Structure refacto  
 - Upgrade to min PHP 7.1 
+- GP-API: Add example with Google Pay
 
 ## v3.1.1 (05/17/2022)
 #### Enhancements:
diff --git a/metadata.xml b/metadata.xml
index 1fa918bc..01bb7198 100644
--- a/metadata.xml
+++ b/metadata.xml
@@ -1,3 +1,3 @@
 <xml>
-  <releaseNumber>4.0.0</releaseNumber>
+  <releaseNumber>4.0.1</releaseNumber>
 </xml>
\ No newline at end of file
diff --git a/src/Entities/HostedPaymentData.php b/src/Entities/HostedPaymentData.php
index 074dc4de..52a3bcdb 100644
--- a/src/Entities/HostedPaymentData.php
+++ b/src/Entities/HostedPaymentData.php
@@ -125,6 +125,9 @@ class HostedPaymentData
     /** @var BankPayment */
     public $bankPayment;
 
+    /** @var boolean */
+    public $enableExemptionOptimization;
+
     /**
      * Instantiates a new `HostedPaymentData` object.
      *
diff --git a/src/Gateways/GpEcomConnector.php b/src/Gateways/GpEcomConnector.php
index 896eb943..feb13982 100644
--- a/src/Gateways/GpEcomConnector.php
+++ b/src/Gateways/GpEcomConnector.php
@@ -387,6 +387,7 @@ public function serializeRequest(AuthorizationBuilder $builder)
             $this->setSerializeData('HPP_CUSTOMER_PHONENUMBER_MOBILE', $hostedPaymentData->customerPhoneMobile);
             $this->setSerializeData('HPP_PHONE', $hostedPaymentData->customerPhoneMobile);
             $this->setSerializeData('HPP_CHALLENGE_REQUEST_INDICATOR', $hostedPaymentData->challengeRequest);
+            $this->setSerializeData('HPP_ENABLE_EXEMPTION_OPTIMIZATION', $hostedPaymentData->enableExemptionOptimization);
             if (isset($hostedPaymentData->addressesMatch)) {
                 $this->setSerializeData('HPP_ADDRESS_MATCH_INDICATOR', $hostedPaymentData->addressesMatch ? 'TRUE' : 'FALSE');
             }
diff --git a/src/Utils/Logging/Logger.php b/src/Utils/Logging/Logger.php
index d5067c7d..92785cb8 100644
--- a/src/Utils/Logging/Logger.php
+++ b/src/Utils/Logging/Logger.php
@@ -308,7 +308,7 @@ private function getTimestamp()
     {
         $originalTime = microtime(true);
         $micro = sprintf("%06d", ($originalTime - floor($originalTime)) * 1000000);
-        $date = new DateTime(date('Y-m-d H:i:s.' . $micro, $originalTime));
+        $date = new DateTime(date('Y-m-d H:i:s.' . $micro, (int) $originalTime));
 
         return $date->format($this->options['dateFormat']);
     }
diff --git a/test/Integration/Gateways/GpEcomConnector/HppTest.php b/test/Integration/Gateways/GpEcomConnector/HppTest.php
index 0735cf30..d3610fec 100644
--- a/test/Integration/Gateways/GpEcomConnector/HppTest.php
+++ b/test/Integration/Gateways/GpEcomConnector/HppTest.php
@@ -18,10 +18,10 @@
 use GlobalPayments\Api\Entities\Enums\AddressType;
 use GlobalPayments\Api\Entities\Enums\FraudFilterMode;
 use GlobalPayments\Api\Entities\Enums\GatewayProvider;
-//use GlobalPayments\Api\ServiceConfigs\Gateways\GpEcomConfig;
 use GlobalPayments\Api\ServiceConfigs\Gateways\GpEcomConfig;
 use GlobalPayments\Api\Tests\Integration\Gateways\GpEcomConnector\Hpp\GpEcomHppClient;
 use GlobalPayments\Api\Entities\Enums\RemittanceReferenceType;
+use GlobalPayments\Api\Entities\Enums\ChallengeRequestIndicator;
 use PHPUnit\Framework\TestCase;
 
 class HppTest extends TestCase
@@ -987,4 +987,36 @@ public function testOpenBankingInitiate()
         $parsedResponse = $service->parseResponse($response);
         $this->assertEquals(BankPaymentStatus::PAYMENT_INITIATED, $parsedResponse->responseMessage);
     }
+
+    public function test3DSExemption()
+    {
+        $config = new GpEcomConfig();
+        $config->merchantId = "heartlandgpsandbox";
+        $config->accountId = "3dsecure";
+        $config->sharedSecret = "secret";
+        $config->hostedPaymentConfig = new HostedPaymentConfig();
+        $config->hostedPaymentConfig->language = "GB";
+        $config->hostedPaymentConfig->responseUrl = "https://www.example.com/response";;
+        $config->hostedPaymentConfig->version = HppVersion::VERSION_2;
+
+        $service = new HostedService($config);
+
+        // data to be passed to the HPP along with transaction level settings
+        $hostedPaymentData = new HostedPaymentData();
+        $hostedPaymentData->enableExemptionOptimization = true;
+        $hostedPaymentData->challengeRequest = ChallengeRequestIndicator::NO_CHALLENGE_REQUESTED;
+
+        //serialize the request
+        $json = $service->charge(10.01)
+            ->withCurrency("EUR")
+            ->withAddress($this->billingAddress, AddressType::BILLING)
+            ->withAddress($this->shippingAddress, AddressType::SHIPPING)
+            ->withHostedPaymentData($hostedPaymentData)
+            ->serialize();
+        $this->assertNotNull($json);
+
+        $jsonResponse = json_decode($json, true);
+        $this->assertTrue(isset($jsonResponse['HPP_ENABLE_EXEMPTION_OPTIMIZATION']));
+        $this->assertEquals(true, $jsonResponse['HPP_ENABLE_EXEMPTION_OPTIMIZATION']);
+    }
 }