Description
We've updated Worldpay payment gateway script and renamed $currency variable to avoid a problem with matching variables.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/worldpay_confirm-4.zip
 
Further, extract the "worldpay_confirm.php" into the 'payments' folder of your shop replacing an existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.