app/code/core/Mage/AmazonPayments/controllers/CbaController.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_AmazonPayments
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class Mage_AmazonPayments_CbaController extends Mage_Core_Controller_Front_Action
{
    /**
     * Get checkout session namespace
     *
     * @return Mage_Checkout_Model_Session
     */
    public function getCheckout()
    {
        return Mage::getSingleton('checkout/session');
    }

    /**
     * Get singleton with Checkout by Amazon order transaction information
     *
     * @return Mage_AmazonPayments_Model_Payment_CBA
     */
    public function getCba()
    {
        return Mage::getSingleton('amazonpayments/payment_cba');
    }

    /**
     * When a customer chooses Checkout by Amazon on Shopping Cart page
     *
     */
    public function shortcutAction()
    {
        if (!$this->getCba()->isAvailable()) {
            $this->_redirect('checkout/cart/');
        }
        $session = $this->getCheckout();
        if ($quoteId = $this->getCheckout()->getQuoteId()) {
            $quote = Mage::getModel('sales/quote')->load($quoteId);

            /** @var $quote Mage_Sales_Model_Quote */
            if ($quote->hasItems()) {
                $session->setAmazonQuoteId($quoteId);

                $quote->getPayment()->setMethod($this->getCba()->getCode());
                $quote->setIsActive(false);
                $quote->save();

                $this->getResponse()->setBody($this->getLayout()->createBlock('amazonpayments/cba_redirect')->toHtml());

                if ($session->hasData('quote_id_'.Mage::app()->getStore()->getWebsiteId())) {
                    $session->unsetData('quote_id_'.Mage::app()->getStore()->getWebsiteId());
                }
            } else {
                $this->_redirect('checkout/cart/');
            }
        } else {
            $this->_redirect('checkout/cart/');
        }
    }

    /**
     * When a customer has checkout on Amazon and return with Successful payment
     *
     */
    public function successAction()
    {
        #$amazonOrderID = Mage::app()->getRequest()->getParam('amznPmtsOrderIds');
        #$referenceId = Mage::app()->getRequest()->getParam('amznPmtsOrderIds');

        $this->getCba()->returnAmazon();

        $this->loadLayout();
        #$this->_initLayoutMessages('amazonpayments/session');
        $this->renderLayout();
    }

    /**
     * When Amazon return callback request for calculation shipping, taxes and etc.
     *
     */
    public function callbackAction()
    {
        $response = '';
        $session = $this->getCheckout();

        $_request = Mage::app()->getRequest()->getParams();

        try {
            if ($_request) {
                $response = $this->getCba()->handleCallback($_request);
            } else {
                $e = new Exception('Inavlid Shipping Address');
            }
        }
        catch (Exception $e) {
            // Return Xml with Error
            $response = $this->getCba()->callbackXmlError($e);
        }
        echo $response;
        exit(0);
    }

    public function notificationAction()
    {
        $response = '';
        $session = $this->getCheckout();

        $_request = Mage::app()->getRequest()->getParams();

        try {
            $this->getCba()
                ->handleNotification($_request);
        }
        catch (Exception $e) {
            // Return Xml with Error
            $response = $this->getCba()->callbackXmlError($e);
        }
        $this->getResponse()
            ->setHttpResponseCode(200);
    }

    /**
     * When a customer has checkout on Amazon and return with Cancel
     *
     */
    public function cancelAction()
    {
        $session = $this->getCheckout();
        if ($quoteId = $session->getAmazonQuoteId()) {
            $quote = Mage::getModel('sales/quote')->load($quoteId);
            $quote->setIsActive(true);
            $quote->save();
            $session->setQuoteId($quoteId);
        }
        if ($this->getCba()->getDebug()) {
            $_request = Mage::app()->getRequest()->getParams();
            $debug = Mage::getModel('amazonpayments/api_debug')
                ->setResponseBody(print_r($_request, 1))
                ->setRequestBody(time() .' - cancel')
                ->save();
        }
        $this->_redirect('checkout/cart/');
    }

}

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