Adjust Plugin for Joomla 3.x

I need to transfer a plugin from Joomla 2.5 to Joomla 3.0 and check, if it works with the corresponding component. The goal is: I sell seminars on my website, the signing-in is handeled by the component DT-Register. On the thank-you-page after a subscription the following code will be executed: -------------------------------- <?php if ($aff = $_SESSION['affiliate_registration_details']) { // Change these values: $aff['AccountId'] = 'default1'; $aff['ProductID'] = 'seminar'; ?> <img src="<?php /*[login to view URL]*/ ?>scripts/[login to view URL]<?php echo $aff['AccountId']?>&TotalCost=<?php echo $aff['fee']?>&OrderID=<?php echo $aff['confirmNum']?>&ProductID=<?php echo $aff['ProductID']?>&Data1=<?php echo $aff['eMail']?>" width="1" height="1" /> <?php $_SESSION['affiliate_registration_details'] = null; ?> <?php } ?> ---------------------------- This script transfers the sale to my affiliate-system. I manualy place the script on the thank-you-page. As far as I know it was the job of the plugin that the three variables TotalCost, OrderID and Data1 can be used in the script on the thank-you-page. The whole thing was working until the Upgrade from Joomla 2.5 to Joomla 3.x. I can provide you with all neccecary data. The plugin itself was codet for me, so I can share it here. As soon as you have the job I also can provide you the full component so you can check it completely. All the best, Julian!