Brief We have updated the file 'order_items.php' file for version 3.6.
Description When orders were passed to 2Checkout payment processor only one item from the order was shown on 2Checkout site. Now all items from the basket are passed and shown.
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.