Brief
We have updated the function get_payment_parameters in the file 'order_items.php' for version 3.6.
 
Description
Taxes were not calculated and passed to Google Checkout payment system.
 
Solution
We would recommend you to download an updated version of the file from here:
http://www.viart.com/downloads/order_items-3.6.zip
 
Further, extract the above mentioned file into the 'includes' folder of your shop in the Binary mode. Do not forget to make a backup copy of the current file in case something goes wrong.