Now, very soon I will be editing this page to show using a helper instead of having the code directly in this file.  But, for now, you can see the code used to do most of the work for this module.

<code php>
<?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.
 *
 * @category   Mage
 * @package    Mage_Paygate
 * @copyright  Copyright (c) 2004-2007 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_Points_Model_Authorizenet extends Mage_Paygate_Model_Authorizenet 
{
    public function onOrderValidate(Mage_Sales_Model_Order_Payment $payment)
    {
        $payment->setAnetTransType(self::REQUEST_TYPE_AUTH_CAPTURE);
        $payment->setDocument($payment->getOrder());
        
        $request = $this->buildRequest($payment);
        $result = $this->postRequest($request);
        
        $payment->setCcApproval($result->getApprovalCode())
            ->setCcTransId($result->getTransactionId())
            ->setCcAvsStatus($result->getAvsResultCode())
            ->setCcCidStatus($result->getCardCodeResponseCode());
            
        switch ($result->getResponseCode()) {
            case self::RESPONSE_CODE_APPROVED:

                $payment->setStatus('APPROVED');
                $payment->getOrder()->addStatus(Mage::getStoreConfig('payment/authorizenet/order_status'));
                
                // Changes start here, first zero out $points and get the $cust_id
                $points = 0;
        $cust_id = $payment->getOrder()->getCustomerId();
                // Iterate through all products in the cart and count the points
                foreach ($payment->getOrder()->getAllItems() as $item)
        {
            $points = $points + ($item->getProduct()->getPoints() * $item->getQtyOrdered());
        }

        // Now see if they have any points in the db
        $currentPoints = Mage::getModel('points/points')->getCustomerPoints($cust_id);
        
        if (!$currentPoints) {
            // So new customers get the added save feature (with extra points for signup)
            Mage::getModel('points/points')->saveCustomerPoints($cust_id, $points);
        }
        else
        {
            // current customers get these new points added to their current points
            Mage::getModel('points/points')->updateCustomerPoints($cust_id, $points);
        }

                break;
                
            case self::RESPONSE_CODE_DECLINED:
                $payment->setStatus('DECLINED');
                $payment->setStatusDescription($result->getResponseReasonText());
                break;
            case self::RESPONSE_CODE_ERROR:
                $payment->setStatus('ERROR');
                $payment->setStatusDescription($result->getResponseReasonText());
                break;
            default:
                $payment->setStatus('UNKNOWN');
                $payment->setStatusDescription($result->getResponseReasonText());
                break;
        }
        
        return $this;
    }
    
}
</code>