Create a Custom Payment Method Module in Magento - PaymentController.php

PaymentController.php

<?php

// app/code/local/Tutsplanet/Localpay/controllers/PaymentController.php
class Tutsplanet_Localpay_PaymentController extends Mage_Core_Controller_Front_Action
{

    /**
     * Rendering the layout
     */
    public function redirectAction()
    {
        $this->loadLayout();
        $block = $this->getLayout()->createBlock('Mage_Core_Block_Template', 'localpay', array('template' => 'localpay/redirect.phtml'));
        $this->getLayout()->getBlock('content')->append($block);
        $this->renderLayout();


    }

    /**
     * print the output
     */

    public function responseAction()
    {

        if ($this->getRequest()->getQuery("vpc_TxnResponseCode") == 0 || ($this->getRequest()->getQuery("vpc_TxnResponseCode") == '00')) {
            $orderId = Mage::getSingleton('checkout/session')->getLastOrderId();
            $order = Mage::getModel('sales/order')->load($orderId);


            $comment = 'vpc_Currency=' . $this->getRequest()->getQuery("vpc_Currency");
            $comment .= ',vpc_Message=' . $this->getRequest()->getQuery("vpc_Message");
            $comment .= ',<br>vpc_OrderInfo=' . $this->getRequest()->getQuery("vpc_OrderInfo");
            $comment .= ',vpc_ReceiptNo=' . $this->getRequest()->getQuery("vpc_ReceiptNo");
            $comment .= ',<br>vpc_TransactionNo=' . $this->getRequest()->getQuery("vpc_TransactionNo");
            $comment .= ',vpc_TxnResponseCode=' . $this->getRequest()->getQuery("vpc_TxnResponseCode");
            $comment .= ',<br>vpc_Amount=' . $this->getRequest()->getQuery("vpc_Amount");
            $comment .= ',vpc_Card=' . $this->getRequest()->getQuery("vpc_Card");
            $comment .= ',<br>vpc_CardNum=' . $this->getRequest()->getQuery("vpc_CardNum");


            //$order->addStatusHistoryComment($comment);
            $order->setState(Mage_Sales_Model_Order::STATE_PROCESSING, true, $comment);
            $order->save();
            Mage::getSingleton('checkout/session')->unsQuoteId();
            Mage_Core_Controller_Varien_Action::_redirect('checkout/onepage/success', array('_secure' => false));
        } else {
            if ($lastQuoteId = Mage::getSingleton('checkout/session')->getLastQuoteId()) {
                $quote = Mage::getModel('sales/quote')->load($lastQuoteId);
                $quote->setIsActive(true)->save();
            }
            Mage::getSingleton('core/session')->addError('Error sending mail');
            Mage_Core_Controller_Varien_Action::_redirect('checkout/onepage/index', array('_secure' => false));
        }
    }
}