I have a store that has insanely complex shipping options and, especially for international orders, calculating the shipping costs by hand is just more practical than trying to do it programatically.
I know that I can edit the order after it has been placed [we're using the PayPal Standard gateway] to add in a new line, a la "International Shipping surcharge". Now that the invoice shows that the balance is, say, $25, how can the customer go back to the order and pay that balance? (Or would it make more sense to create a whole new order with just the shipping cost? How would they pay that?)
Thanks!
