diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8a282a5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/vendor
+composer.lock
+composer.phar
+phpunit.xml
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..8574752
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,14 @@
+language: php
+
+php:
+  - 5.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
+
+before_script:
+  - composer install -n --dev --prefer-source
+
+script: vendor/bin/phpcs --standard=PSR2 -n src && vendor/bin/phpunit --coverage-text
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..d67ed30
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,10 @@
+# Contributing Guidelines
+
+* Fork the project.
+* Make your feature addition or bug fix.
+* Add tests for it. This is important so I don't break it in a future version unintentionally.
+* Commit just the modifications, do not mess with the composer.json or CHANGELOG.md files.
+* Ensure your code is nicely formatted in the [PSR-2](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)
+  style and that all tests pass.
+* Send the pull request.
+* Check that the Travis CI build passed. If not, rinse and repeat.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..ec909c9
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Lee Siong Chan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index dffd755..ad25d7a 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,62 @@
-# omnipay-molpay
-MOLPay driver for the Omnipay PHP payment processing library
+# Omnipay: MOLPay
+
+**MOLPay driver for the Omnipay PHP payment processing library**
+
+[![Build Status](https://travis-ci.org/leesiongchan/omnipay-molpay.png?branch=master)](https://travis-ci.org/leesiongchan/omnipay-molpay)
+[![Latest Stable Version](https://poser.pugx.org/leesiongchan/omnipay-molpay/v/stable)](https://packagist.org/packages/leesiongchan/omnipay-molpay)
+[![Total Downloads](https://poser.pugx.org/leesiongchan/omnipay-molpay/downloads)](https://packagist.org/packages/leesiongchan/omnipay-molpay)
+[![Latest Unstable Version](https://poser.pugx.org/leesiongchan/omnipay-molpay/v/unstable)](https://packagist.org/packages/leesiongchan/omnipay-molpay)
+[![License](https://poser.pugx.org/leesiongchan/omnipay-molpay/license)](https://packagist.org/packages/leesiongchan/omnipay-molpay)
+
+[Omnipay](https://github.com/thephpleague/omnipay) is a framework agnostic, multi-gateway payment
+processing library for PHP 5.3+. This package implements MOLPay support for Omnipay.
+
+[MOLPay](http://www.molpay.com) is a payment gateway offering from MOLPay Sdn Bhd. This package follows the **MOLPay API Specification (Version 12.1: Updated on 12 April 2015)**.
+
+## Installation
+
+Omnipay is installed via [Composer](http://getcomposer.org/). To install, simply add it
+to your `composer.json` file:
+
+```json
+{
+    "require": {
+        "leesiongchan/omnipay-molpay": "~2.0"
+    }
+}
+```
+
+And run composer to update your dependencies:
+
+    $ curl -s http://getcomposer.org/installer | php
+    $ php composer.phar update
+
+## Basic Usage
+
+The following gateways are provided by this package:
+
+* MOLPay (MOLPay Payment)
+
+For general usage instructions, please see the main [Omnipay](https://github.com/thephpleague/omnipay)
+repository.
+
+## Usage
+
+Coming soon...
+
+## Out Of Scope
+
+Omnipay does not cover recurring payments or billing agreements, and so those features are not included in this package. Extensions to this gateway are always welcome. 
+
+## Support
+
+If you are having general issues with Omnipay, we suggest posting on
+[Stack Overflow](http://stackoverflow.com/). Be sure to add the
+[omnipay tag](http://stackoverflow.com/questions/tagged/omnipay) so it can be easily found.
+
+If you want to keep up to date with release anouncements, discuss ideas for the project,
+or ask more detailed questions, there is also a [mailing list](https://groups.google.com/forum/#!forum/omnipay) which
+you can subscribe to.
+
+If you believe you have found a bug, please report it using the [GitHub issue tracker](https://github.com/leesiongchan/omnipay-molpay/issues),
+or better yet, fork the library and submit a pull request.
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..c0d0009
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,39 @@
+{
+    "name": "leesiongchan/omnipay-molpay",
+    "type": "library",
+    "description": "MOLPay gateway for Omnipay payment processing library",
+    "keywords": [
+        "gateway",
+        "merchant",
+        "molpay",
+        "omnipay",
+        "pay",
+        "payment",
+        "purchase"
+    ],
+    "homepage": "https://github.com/leesiongchan/omnipay-molpay",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Lee Siong Chan",
+            "email": "ahlee2326@me.com"
+        }
+    ],
+    "autoload": {
+        "psr-4": { "Omnipay\\MOLPay\\" : "src/" }
+    },
+    "autoload-dev": {
+        "psr-4": { "Omnipay\\MOLPay\\Tests\\": "tests/" }
+    },
+    "require": {
+        "omnipay/common": "~2.0"
+    },
+    "require-dev": {
+        "omnipay/tests": "~2.0"
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.0.x-dev"
+        }
+    }
+}
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..a35b736
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false">
+    <testsuites>
+        <testsuite name="Omnipay Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <listeners>
+        <listener class="Mockery\Adapter\Phpunit\TestListener" file="vendor/mockery/mockery/library/Mockery/Adapter/Phpunit/TestListener.php" />
+    </listeners>
+    <filter>
+        <whitelist>
+            <directory>./src</directory>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/src/Exception/InvalidCreditCardDetailsException.php b/src/Exception/InvalidCreditCardDetailsException.php
new file mode 100644
index 0000000..d6a1d24
--- /dev/null
+++ b/src/Exception/InvalidCreditCardDetailsException.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Omnipay\MOLPay\Exception;
+
+use Omnipay\Common\Exception\OmnipayException;
+
+/**
+ * Invalid Credit Card Details Exception.
+ *
+ * Thrown when a credit card details is invalid or missing required fields.
+ */
+class InvalidCreditCardDetailsException extends \Exception implements OmnipayException
+{
+}
diff --git a/src/Exception/InvalidPaymentMethodException.php b/src/Exception/InvalidPaymentMethodException.php
new file mode 100644
index 0000000..c01aff3
--- /dev/null
+++ b/src/Exception/InvalidPaymentMethodException.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Omnipay\MOLPay\Exception;
+
+use Omnipay\Common\Exception\OmnipayException;
+
+/**
+ * Invalid Payment Method Exception.
+ *
+ * Thrown when a payment method is invalid.
+ */
+class InvalidPaymentMethodException extends \Exception implements OmnipayException
+{
+}
diff --git a/src/Gateway.php b/src/Gateway.php
new file mode 100644
index 0000000..d2a1bfe
--- /dev/null
+++ b/src/Gateway.php
@@ -0,0 +1,163 @@
+<?php
+
+namespace Omnipay\MOLPay;
+
+use Omnipay\Common\AbstractGateway;
+
+class Gateway extends AbstractGateway
+{
+    /**
+     * Get the name of the gateway.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return 'MOLPay';
+    }
+
+    /**
+     * Get the gateway parameters.
+     *
+     * @return array
+     */
+    public function getDefaultParameters()
+    {
+        return array(
+            'enableIPN' => false,
+            'locale' => 'en',
+            'testMode' => false,
+        );
+    }
+
+    /**
+     * Get enableIPN.
+     *
+     * @return bool
+     */
+    public function getEnableIPN()
+    {
+        return $this->getParameter('enableIPN');
+    }
+
+    /**
+     * Set enableIPN.
+     *
+     * @param bool $value
+     *
+     * @return $this
+     */
+    public function setEnableIPN($value)
+    {
+        return $this->setParameter('enableIPN', $value);
+    }
+
+    /**
+     * Get the locale.
+     *
+     * The default language is English.
+     *
+     * @return string
+     */
+    public function getLocale()
+    {
+        return $this->getParameter('locale');
+    }
+
+    /**
+     * Set the locale.
+     *
+     * The default language is English.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setLocale($value)
+    {
+        return $this->setParameter('locale', $value);
+    }
+
+    /**
+     * Get merchantId.
+     *
+     * @return string
+     */
+    public function getMerchantId()
+    {
+        return $this->getParameter('merchantId');
+    }
+
+    /**
+     * Set merchantId.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setMerchantId($value)
+    {
+        return $this->setParameter('merchantId', $value);
+    }
+
+    /**
+     * Get verifyKey.
+     *
+     * @return string
+     */
+    public function getVerifyKey()
+    {
+        return $this->getParameter('verifyKey');
+    }
+
+    /**
+     * Set verifyKey.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setVerifyKey($value)
+    {
+        return $this->setParameter('verifyKey', $value);
+    }
+
+    /**
+     * Create a purchase request.
+     *
+     * @param array $parameters
+     *
+     * @return \Omnipay\MOLPay\Message\PurchaseRequest
+     */
+    public function purchase(array $parameters = array())
+    {
+        return $this->createRequest('\Omnipay\MOLPay\Message\PurchaseRequest', $parameters);
+    }
+
+    /**
+     * Complete a purchase request.
+     *
+     * @param array $parameters
+     *
+     * @return \Omnipay\MOLPay\Message\CompletePurchaseRequest
+     */
+    public function completePurchase(array $parameters = array())
+    {
+        return $this->createRequest(
+            '\Omnipay\MOLPay\Message\CompletePurchaseRequest',
+            array_merge(
+                $parameters,
+                array(
+                    'appCode' => $this->httpRequest->request->get('appcode'),
+                    'domain' => $this->httpRequest->request->get('domain'),
+                    'errorMessage' => $this->httpRequest->request->get('error_desc'),
+                    'nbcb' => $this->httpRequest->request->get('nbcb'),
+                    'payDate' => $this->httpRequest->request->get('paydate'),
+                    'sKey' => $this->httpRequest->request->get('skey'),
+                    'status' => $this->httpRequest->request->get('status'),
+                    'transactionReference' => $this->httpRequest->request->get('tranID'),
+                )
+            )
+        );
+    }
+}
diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
new file mode 100644
index 0000000..c301798
--- /dev/null
+++ b/src/Message/AbstractRequest.php
@@ -0,0 +1,193 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Common\Helper;
+use Omnipay\Common\Message\AbstractRequest as BaseAbstractRequest;
+use Omnipay\MOLPay\Exception\InvalidCreditCardDetailsException;
+use Omnipay\MOLPay\Exception\InvalidPaymentMethodException;
+use Omnipay\MOLPay\PaymentMethod;
+
+abstract class AbstractRequest extends BaseAbstractRequest
+{
+    const API_VERSION = '12.1';
+
+    /**
+     * Endpoint URL.
+     *
+     * @var string
+     */
+    protected $endpoint = 'https://www.onlinepayment.com.my/MOLPay/pay/';
+
+    /**
+     * MOLPay IPN (Instant Payment Notification) endpoint URL.
+     *
+     * @var string
+     */
+    protected $IPNEndpoint = 'https://www.onlinepayment.com.my/MOLPay/API/chkstat/returnipn.php';
+
+    /**
+     * Get enableIPN.
+     * 
+     * @return bool
+     */
+    public function getEnableIPN()
+    {
+        return $this->getParameter('enableIPN');
+    }
+
+    /**
+     * Set enableIPN.
+     *
+     * @param bool $value
+     *
+     * @return $this
+     */
+    public function setEnableIPN($value)
+    {
+        return $this->setParameter('enableIPN', $value);
+    }
+
+    /**
+     * Get locale.
+     *
+     * @return string
+     */
+    public function getLocale()
+    {
+        return $this->getParameter('locale');
+    }
+
+    /**
+     * Set locale.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setLocale($value)
+    {
+        return $this->setParameter('locale', $value);
+    }
+
+    /**
+     * Get merchantId.
+     *
+     * @return string
+     */
+    public function getMerchantId()
+    {
+        return $this->getParameter('merchantId');
+    }
+
+    /**
+     * Set merchantId.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setMerchantId($value)
+    {
+        return $this->setParameter('merchantId', $value);
+    }
+
+    /**
+     * Get verifyKey.
+     *
+     * @return string
+     */
+    public function getVerifyKey()
+    {
+        return $this->getParameter('verifyKey');
+    }
+
+    /**
+     * Set verifyKey.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setVerifyKey($value)
+    {
+        return $this->setParameter('verifyKey', $value);
+    }
+
+    /**
+     * Get endpoint.
+     *
+     * @return string
+     */
+    public function getEndpoint()
+    {
+        $this->validate('merchantId');
+
+        return $this->endpoint.$this->getMerchantId().'/';
+    }
+
+    /**
+     * Send IPN (Instant Payment Notification).
+     */
+    protected function sendIPN()
+    {
+        $data = $this->httpRequest->request->all();
+
+        $data['treq'] = 1; // Additional parameter required by IPN
+
+        $this->httpClient->post($this->IPNEndpoint, null, $data)->send();
+    }
+
+    /**
+     * Validate credit card details:
+     * - country
+     * - email
+     * - name
+     * - phone.
+     */
+    protected function validateCreditCardDetails()
+    {
+        $this->validate('card');
+
+        $card = $this->getCard();
+
+        foreach (array('country', 'email', 'name', 'phone') as $key) {
+            $method = 'get'.ucfirst(Helper::camelCase($key));
+
+            if (null === $card->$method()) {
+                throw new InvalidCreditCardDetailsException("The $key parameter is required");
+            }
+        }
+    }
+
+    /**
+     * Validate payment method:
+     * - Affin Bank
+     * - AmOnline
+     * - CIMB Clicks
+     * - Credit Card
+     * - FPX
+     * - Hong Leong Connect
+     * - Maybank2u
+     * - RHB Now.
+     */
+    protected function validatePaymentMethod()
+    {
+        $this->validate('paymentMethod');
+
+        $paymentMethod = $this->getPaymentMethod();
+
+        if (
+            PaymentMethod::AFFIN_BANK !== $paymentMethod &&
+            PaymentMethod::AM_ONLINE !== $paymentMethod &&
+            PaymentMethod::CIMB_CLICKS !== $paymentMethod &&
+            PaymentMethod::CREDIT_CARD !== $paymentMethod &&
+            PaymentMethod::FPX !== $paymentMethod &&
+            PaymentMethod::HONG_LEONG_CONNECT !== $paymentMethod &&
+            PaymentMethod::MAYBANK2U !== $paymentMethod &&
+            PaymentMethod::RHB_NOW !== $paymentMethod
+        ) {
+            throw new InvalidPaymentMethodException("The payment method ($paymentMethod) is not supported");
+        }
+    }
+}
diff --git a/src/Message/CompletePurchaseRequest.php b/src/Message/CompletePurchaseRequest.php
new file mode 100644
index 0000000..3f93439
--- /dev/null
+++ b/src/Message/CompletePurchaseRequest.php
@@ -0,0 +1,270 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Common\Exception\InvalidResponseException;
+
+/**
+ * MOLPay Purchase Request.
+ *
+ * ### Parameters
+ *
+ * * amount               [required] - Total amount to be paid
+ * * appCode              [required] - Bank approval code
+ * * domain               [required] - Merchant ID in MOLPay system
+ * * errorMessage                    - Error message
+ * * payDate              [required] - Date/Time of the transaction
+ * * nbcb                            - Notification from MOLPay
+ *                                     - 1 for callback notification
+ *                                     - 2 for notification
+ * * sKey                 [required] - Data integrity protection hash string.
+ * * status               [required] - Payment status
+ *                                     - 00 for successful payment
+ *                                     - 11 for failure payment
+ *                                     - 22 for pending payment
+ * * transactionId        [required] - Invoice or order number from merchant system
+ * * transactionReference [required] - Transaction ID generated by MOLPay
+ * * verifyKey            [required] - Encrypted key generated by MOLPay
+ */
+class CompletePurchaseRequest extends AbstractRequest
+{
+    /**
+     * Get appCode.
+     *
+     * @return string
+     */
+    public function getAppCode()
+    {
+        return $this->getParameter('appCode');
+    }
+
+    /**
+     * Set appCode.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setAppCode($value)
+    {
+        return $this->setParameter('appCode', $value);
+    }
+
+    /**
+     * Get domain.
+     *
+     * @return string
+     */
+    public function getDomain()
+    {
+        return $this->getParameter('domain');
+    }
+
+    /**
+     * Set domain.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setDomain($value)
+    {
+        return $this->setParameter('domain', $value);
+    }
+
+    /**
+     * Get errorMessage.
+     *
+     * @return string
+     */
+    public function getErrorMessage()
+    {
+        return $this->getParameter('errorMessage');
+    }
+
+    /**
+     * Set errorMessage.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setErrorMessage($value)
+    {
+        return $this->setParameter('errorMessage', $value);
+    }
+
+    /**
+     * Get payDate.
+     *
+     * @return string
+     */
+    public function getPayDate()
+    {
+        return $this->getParameter('payDate');
+    }
+
+    /**
+     * Set payDate.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setPayDate($value)
+    {
+        return $this->setParameter('payDate', $value);
+    }
+
+    /**
+     * Get nbcb.
+     *
+     * @return string
+     */
+    public function getNBCB()
+    {
+        return $this->getParameter('nbcb');
+    }
+
+    /**
+     * Set nbcb.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setNBCB($value)
+    {
+        return $this->setParameter('nbcb', $value);
+    }
+
+    /**
+     * Get sKey.
+     *
+     * @return string
+     */
+    public function getSKey()
+    {
+        return $this->getParameter('sKey');
+    }
+
+    /**
+     * Set sKey.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setSKey($value)
+    {
+        return $this->setParameter('sKey', $value);
+    }
+
+    /**
+     * Get status.
+     *
+     * @return string
+     */
+    public function getStatus()
+    {
+        return $this->getParameter('status');
+    }
+
+    /**
+     * Set status.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setStatus($value)
+    {
+        return $this->setParameter('status', $value);
+    }
+
+    /**
+     * Get transactionReference.
+     *
+     * @return string
+     */
+    public function getTransactionReference()
+    {
+        return $this->getParameter('transactionReference');
+    }
+
+    /**
+     * Set transactionReference.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setTransactionReference($value)
+    {
+        return $this->setParameter('transactionReference', $value);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getData()
+    {
+        if (null !== $this->getErrorMessage()) {
+            throw new InvalidResponseException($this->getErrorMessage());
+        }
+
+        $this->validate('sKey');
+
+        $sKey = $this->getSKey(); // Security key generated by MOLPay
+
+        $generatedSKey = $this->generateSKey(); // Security key generated by merchant
+
+        if ($sKey != $generatedSKey) {
+            throw new InvalidResponseException('Invalid security key');
+        }
+
+        return array(
+            'nbcb' => $this->getNBCB(),
+            'status' => $this->getStatus(),
+            'transactionId' => $this->getTransactionId(),
+            'transactionReference' => $this->getTransactionReference(),
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function sendData($data)
+    {
+        // Acknowledge MOLPay via IPN
+        if (true === $this->getEnableIPN()) {
+            $this->sendIPN();
+        }
+
+        return $this->response = new CompletePurchaseResponse($this, $data);
+    }
+
+    /**
+     * Generate pre-sKey - first hash encryption.
+     *
+     * @return string
+     */
+    protected function generatePreSKey()
+    {
+        $this->validate('amount', 'currency', 'domain', 'status', 'transactionId', 'transactionReference');
+
+        return md5($this->getTransactionReference().$this->getTransactionId().$this->getStatus().$this->getDomain().$this->getAmount().$this->getCurrency());
+    }
+
+    /**
+     * Generate sKey - final hash encryption.
+     *
+     * @return string
+     */
+    protected function generateSKey()
+    {
+        $this->validate('appCode', 'domain', 'payDate', 'verifyKey');
+
+        return md5($this->getPayDate().$this->getDomain().$this->generatePreSKey().$this->getAppCode().$this->getVerifyKey());
+    }
+}
diff --git a/src/Message/CompletePurchaseResponse.php b/src/Message/CompletePurchaseResponse.php
new file mode 100644
index 0000000..9b7ad35
--- /dev/null
+++ b/src/Message/CompletePurchaseResponse.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Common\Message\AbstractResponse;
+
+class CompletePurchaseResponse extends AbstractResponse
+{
+    /**
+     * Get message.
+     *
+     * @return string
+     */
+    public function getMessage()
+    {
+        return $this->getRequest()->getMessage();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTransactionId()
+    {
+        return $this->getRequest()->getTransactionId();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTransactionReference()
+    {
+        return $this->getRequest()->getTransactionReference();
+    }
+
+    /**
+     * Check if the request is a callback notification.
+     *
+     * @return bool
+     */
+    public function isCallbackNotification()
+    {
+        return '1' === $this->getRequest()->getNBCB();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isCancelled()
+    {
+        return '11' === $this->getRequest()->getStatus();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isPending()
+    {
+        return '22' === $this->getRequest()->getStatus();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isSuccessful()
+    {
+        return '00' === $this->getRequest()->getStatus();
+    }
+}
diff --git a/src/Message/PurchaseRequest.php b/src/Message/PurchaseRequest.php
new file mode 100644
index 0000000..b062287
--- /dev/null
+++ b/src/Message/PurchaseRequest.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+/**
+ * MOLPay Purchase Request.
+ *
+ * ### Parameters
+ *
+ * * amount        [required] - Total amount to be paid
+ * * card          [required] - Credit card details as an Omnipay CreditCard object
+ * * description   [required] - Description of the purchase
+ * * marchantId    [required] - Merchant ID provided by MOLPay
+ * * transactionId [required] - Invoice or order number from merchant system
+ * * verifyKey     [required] - Encrypted key generated by MOLPay
+ */
+class PurchaseRequest extends AbstractRequest
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getData()
+    {
+        $this->validate('amount', 'card', 'description', 'merchantId', 'transactionId', 'verifyKey');
+        $this->validateCreditCardDetails();
+
+        if ($this->getPaymentMethod()) {
+            $this->validatePaymentMethod();
+        }
+
+        $card = $this->getCard();
+
+        return array(
+            'amount' => $this->getAmount(),
+            'bill_desc' => $this->getDescription(),
+            'bill_email' => $card->getEmail(),
+            'bill_mobile' => $card->getPhone(),
+            'bill_name' => $card->getName(),
+            'channel' => $this->getPaymentMethod(),
+            'country' => $card->getCountry(),
+            'currency' => $this->getCurrency(),
+            'langcode' => $this->getLocale(),
+            'orderid' => $this->getTransactionId(),
+            'vcode' => $this->generateVCode(),
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function sendData($data)
+    {
+        return $this->response = new PurchaseResponse($this, $data);
+    }
+
+    /**
+     * Generate vCode.
+     *
+     * @return string
+     */
+    protected function generateVCode()
+    {
+        $this->validate('amount', 'merchantId', 'transactionId', 'verifyKey');
+
+        return md5($this->getAmount().$this->getMerchantId().$this->getTransactionId().$this->getVerifyKey());
+    }
+}
diff --git a/src/Message/PurchaseResponse.php b/src/Message/PurchaseResponse.php
new file mode 100644
index 0000000..38315af
--- /dev/null
+++ b/src/Message/PurchaseResponse.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Common\Message\AbstractResponse;
+use Omnipay\Common\Message\RedirectResponseInterface;
+
+class PurchaseResponse extends AbstractResponse implements RedirectResponseInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getRedirectData()
+    {
+        return;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getRedirectMethod()
+    {
+        return 'GET';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getRedirectUrl()
+    {
+        return $this->getRequest()->getEndpoint().'?'.http_build_query($this->data);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isRedirect()
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isSuccessful()
+    {
+        return false;
+    }
+}
diff --git a/src/PaymentMethod.php b/src/PaymentMethod.php
new file mode 100644
index 0000000..5a523ae
--- /dev/null
+++ b/src/PaymentMethod.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Omnipay\MOLPay;
+
+/**
+ * Payment methods accepted by MOLPay.
+ */
+class PaymentMethod
+{
+    const AFFIN_BANK = 'affin-­epg';
+    const AM_ONLINE = 'amb';
+    const CIMB_CLICKS = 'cimb';
+    const CREDIT_CARD = 'credit';
+    const FPX = 'fpx';
+    const HONG_LEONG_CONNECT = 'hlb';
+    const MAYBANK2U = 'maybank2u';
+    const RHB_NOW = 'rhb';
+}
diff --git a/tests/GatewayTest.php b/tests/GatewayTest.php
new file mode 100644
index 0000000..5fa561a
--- /dev/null
+++ b/tests/GatewayTest.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Omnipay\MOLPay;
+
+use Omnipay\Common\CreditCard;
+use Omnipay\Tests\GatewayTestCase;
+
+class GatewayTest extends GatewayTestCase
+{
+    /**
+     * @var \Omnipay\MOLPay\Gateway
+     */
+    protected $gateway;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->gateway = new Gateway($this->getHttpClient(), $this->getHttpRequest());
+
+        $this->gateway->setCurrency('MYR');
+        $this->gateway->setLocale('en');
+        $this->gateway->setMerchantId('test1234');
+        $this->gateway->setVerifyKey('abcdefg');
+
+        $this->options = array(
+            'amount' => '10.00',
+            'card' => new CreditCard(array(
+                'country' => 'MY',
+                'email' => 'ahlee2326@me.com',
+                'name' => 'Lee Siong Chan',
+                'phone' => '0123456789',
+            )),
+            'description' => 'Test Payment',
+            'transactionId' => '20160331082207680000',
+            'paymentMethod' => 'credit',
+            'returnUrl' => 'https://example.com/return',
+            'notifyUrl' => 'https://example.com/notify',
+        );
+    }
+
+    public function testPurchase()
+    {
+        $response = $this->gateway->purchase($this->options)->send();
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertTrue($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertEquals(
+            'https://www.onlinepayment.com.my/MOLPay/pay/test1234/?amount=10.00&bill_desc=Test+Payment&bill_email=ahlee2326%40me.com&bill_mobile=0123456789&bill_name=Lee+Siong+Chan&channel=credit&country=MY&currency=MYR&langcode=en&orderid=20160331082207680000&vcode=f3d5496b444ae3d11e09fa92a753ac60',
+            $response->getRedirectUrl()
+        );
+    }
+
+    public function testCompletePurchaseSuccess()
+    {
+        $this->getHttpRequest()->request->replace(array(
+            'appcode' => 'abcdefg',
+            'domain' => 'test4321',
+            'paydate' => '2016-03-29 04:02:21',
+            'skey' => '0c1e98d6d58f9a30b919bcaeb9790852',
+            'status' => '00',
+            'tranID' => '000001',
+        ));
+
+        $response = $this->gateway->completePurchase($this->options)->send();
+
+        $this->assertTrue($response->isSuccessful());
+        $this->assertFalse($response->isRedirect());
+    }
+
+    /**
+     * @expectedException \Omnipay\Common\Exception\InvalidResponseException
+     */
+    public function testCompletePurchaseInvalidSKey()
+    {
+        $this->getHttpRequest()->request->replace(array(
+            'appcode' => 'abcdefg',
+            'domain' => 'test4321',
+            'paydate' => '2016-03-29 04:02:21',
+            'skey' => 'I_AM_INVALID_SKEY',
+            'status' => '11',
+            'tranID' => '000001',
+        ));
+
+        $response = $this->gateway->completePurchase($this->options)->send();
+    }
+
+    /**
+     * @expectedException \Omnipay\Common\Exception\InvalidResponseException
+     */
+    public function testCompletePurchaseError()
+    {
+        $this->getHttpRequest()->request->replace(array(
+            'appcode' => 'abcdefg',
+            'domain' => 'test4321',
+            'paydate' => 'I am not a date',
+            'skey' => 'ef0903d1906d0968605155f85ec9fcd5',
+            'status' => '11',
+            'error_desc' => 'Invalid date',
+            'tranID' => '000001',
+        ));
+
+        $response = $this->gateway->completePurchase($this->options)->send();
+        $this->assertFalse($response->isSuccessful());
+        $this->assertFalse($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertEquals('Invalid date', $response->getMessage());
+    }
+}
diff --git a/tests/Message/CompletePurchaseRequestTest.php b/tests/Message/CompletePurchaseRequestTest.php
new file mode 100644
index 0000000..7876a1c
--- /dev/null
+++ b/tests/Message/CompletePurchaseRequestTest.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Tests\TestCase;
+
+class CompletePurchaseRequestTest extends TestCase
+{
+    public function setUp()
+    {
+        $this->request = new CompletePurchaseRequest($this->getHttpClient(), $this->getHttpRequest());
+
+        $this->request->initialize(array(
+            'amount' => '10.00',
+            'appCode' => 'abcdefg',
+            'currency' => 'MYR',
+            'domain' => 'test4321',
+            'payDate' => '2016-03-29 04:02:21',
+            'sKey' => '0c1e98d6d58f9a30b919bcaeb9790852',
+            'status' => '00',
+            'transactionId' => '20160331082207680000',
+            'transactionReference' => '000001',
+            'verifyKey' => 'abcdefg',
+        ));
+    }
+
+    public function testGetData()
+    {
+        $data = $this->request->getData();
+
+        $this->assertEquals('00', $data['status']);
+        $this->assertEquals('000001', $data['transactionReference']);
+    }
+
+    public function testSendSuccess()
+    {
+        $this->request->setStatus('00');
+        $this->request->setSKey('0c1e98d6d58f9a30b919bcaeb9790852');
+
+        $response = $this->request->send();
+
+        $this->assertEquals('000001', $response->getTransactionReference());
+        $this->assertFalse($response->isCancelled());
+        $this->assertFalse($response->isPending());
+        $this->assertFalse($response->isRedirect());
+        $this->assertTrue($response->isSuccessful());
+    }
+
+    public function testSendCancel()
+    {
+        $this->request->setStatus('11');
+        $this->request->setSKey('1298d6c091a476a8e995051eb9d66805');
+
+        $response = $this->request->send();
+
+        $this->assertEquals('000001', $response->getTransactionReference());
+        $this->assertTrue($response->isCancelled());
+        $this->assertFalse($response->isPending());
+        $this->assertFalse($response->isRedirect());
+        $this->assertFalse($response->isSuccessful());
+    }
+
+    public function testSendPending()
+    {
+        $this->request->setStatus('22');
+        $this->request->setSKey('8192eb5627012f236fc36e73f5d49a5e');
+
+        $response = $this->request->send();
+
+        $this->assertEquals('000001', $response->getTransactionReference());
+        $this->assertFalse($response->isCancelled());
+        $this->assertTrue($response->isPending());
+        $this->assertFalse($response->isRedirect());
+        $this->assertFalse($response->isSuccessful());
+    }
+}
diff --git a/tests/Message/CompletePurchaseResponseTest.php b/tests/Message/CompletePurchaseResponseTest.php
new file mode 100644
index 0000000..fc14b2d
--- /dev/null
+++ b/tests/Message/CompletePurchaseResponseTest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Tests\TestCase;
+
+class CompletePurchaseResponseTest extends TestCase
+{
+    public function setUp()
+    {
+        $this->response = new CompletePurchaseResponse($this->getMockRequest(), array());
+    }
+
+    public function testCompletePurchaseSuccess()
+    {
+        $this->getMockRequest()->shouldReceive('getStatus')->andReturn('00');
+        $this->getMockRequest()->shouldReceive('getTransactionId')->andReturn('20160331082207680000');
+        $this->getMockRequest()->shouldReceive('getTransactionReference')->andReturn('000001');
+
+        $this->assertTrue($this->response->isSuccessful());
+        $this->assertEquals('20160331082207680000', $this->response->getTransactionId());
+        $this->assertEquals('000001', $this->response->getTransactionReference());
+    }
+
+    public function testCompletePurchaseCancel()
+    {
+        $this->getMockRequest()->shouldReceive('getStatus')->andReturn('11');
+
+        $this->assertTrue($this->response->isCancelled());
+    }
+
+    public function testCompletePurchasePending()
+    {
+        $this->getMockRequest()->shouldReceive('getStatus')->andReturn('22');
+
+        $this->assertTrue($this->response->isPending());
+    }
+
+    public function testCompletePurchaseCallbackNotification()
+    {
+        $this->getMockRequest()->shouldReceive('getNBCB')->andReturn('1');
+
+        $this->assertTrue($this->response->isCallbackNotification());
+    }
+}
diff --git a/tests/Message/PurchaseRequestTest.php b/tests/Message/PurchaseRequestTest.php
new file mode 100644
index 0000000..02aba28
--- /dev/null
+++ b/tests/Message/PurchaseRequestTest.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Common\CreditCard;
+use Omnipay\Tests\TestCase;
+
+class PurchaseRequestTest extends TestCase
+{
+    public function setUp()
+    {
+        $this->request = new PurchaseRequest($this->getHttpClient(), $this->getHttpRequest());
+
+        $this->request->initialize(array(
+            'amount' => '10.00',
+            'card' => new CreditCard(array(
+                'country' => 'MY',
+                'email' => 'ahlee2326@me.com',
+                'name' => 'Lee Siong Chan',
+                'phone' => '0123456789',
+            )),
+            'currency' => 'MYR',
+            'description' => 'Test Payment',
+            'locale' => 'en',
+            'merchantId' => 'test1234',
+            'paymentMethod' => 'credit',
+            'transactionId' => '20160331082207680000',
+            'verifyKey' => 'abcdefg',
+        ));
+    }
+
+    public function testGetData()
+    {
+        $data = $this->request->getData();
+
+        $this->assertEquals('10.00', $data['amount']);
+        $this->assertEquals('MY', $data['country']);
+        $this->assertEquals('ahlee2326@me.com', $data['bill_email']);
+        $this->assertEquals('Lee Siong Chan', $data['bill_name']);
+        $this->assertEquals('0123456789', $data['bill_mobile']);
+        $this->assertEquals('MYR', $data['currency']);
+        $this->assertEquals('Test Payment', $data['bill_desc']);
+        $this->assertEquals('en', $data['langcode']);
+        $this->assertEquals('credit', $data['channel']);
+        $this->assertEquals('20160331082207680000', $data['orderid']);
+        $this->assertEquals('f3d5496b444ae3d11e09fa92a753ac60', $data['vcode']);
+    }
+
+    public function testSendSuccess()
+    {
+        $response = $this->request->send();
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertTrue($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertEquals(
+            'https://www.onlinepayment.com.my/MOLPay/pay/test1234/?amount=10.00&bill_desc=Test+Payment&bill_email=ahlee2326%40me.com&bill_mobile=0123456789&bill_name=Lee+Siong+Chan&channel=credit&country=MY&currency=MYR&langcode=en&orderid=20160331082207680000&vcode=f3d5496b444ae3d11e09fa92a753ac60',
+            $response->getRedirectUrl()
+        );
+    }
+}
diff --git a/tests/Message/PurchaseResponseTest.php b/tests/Message/PurchaseResponseTest.php
new file mode 100644
index 0000000..51562c5
--- /dev/null
+++ b/tests/Message/PurchaseResponseTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Omnipay\MOLPay\Message;
+
+use Omnipay\Tests\TestCase;
+
+class PurchaseResponseTest extends TestCase
+{
+    public function testPurchaseSuccess()
+    {
+        $response = new PurchaseResponse($this->getMockRequest(), array(
+            'amount' => 1000,
+        ));
+
+        $this->getMockRequest()->shouldReceive('getEndpoint')->once()->andReturn('https://www.onlinepayment.com.my/MOLPay/pay/');
+
+        $this->assertFalse($response->isSuccessful());
+        $this->assertTrue($response->isRedirect());
+        $this->assertNull($response->getTransactionReference());
+        $this->assertEquals('https://www.onlinepayment.com.my/MOLPay/pay/?amount=1000', $response->getRedirectUrl());
+        $this->assertEquals('GET', $response->getRedirectMethod());
+        $this->assertNull($response->getRedirectData());
+    }
+}