Adding Some Value To Order Total At Order Details Page

Some credit cards in my country charge extra money for installment. I need to add this charge to order total. How to add some value to order total? I want to show it at order details page at admin. (Just like taxes)

How to implement surcharge to order manually/custom?

Some credit cards in my country charge extra money for installment. I need to add this charge to order total. How to add some value to order total? I want to show it at order details page at admin. (Just like taxes)

How to implement surcharge to order manually/custom?

Use hooks in the fn_calculate_cart_content function (app/functions/fn.cart.php) to change the value of the $cart['total']. To display it on the order details and invoices pages, it is required to know which email editor do you use - old or new one?