I am currently setting up a contract with a drop shipping company that does all shipping and handling of a product. I would like to be able to charge both a per-order handling fee, as well as a small per-item handling fee, to cover my own costs.

Additionally, at least one Canada Post shipping option does not offer a bulk discount to companies that offer order fulfillment services like this. That is the International Small Packet Air option. Bulk discounts are one of the ways that order fulfillment services earn revenue, and so this particular service will charge an extra 2% whenever that shipping option is selected. I need to be able to adjust the shipping rate by that amount, and possibly for other options.

It would be great if all of these calculations were hidden and included in the output of the shipping and handling rates.

Can you make this more customizable?