How do I enter shipping, payment fees and handling?

As cost rules under “Rules”. Rules only apply where an order has no actual costs, and they're labeled as “Rule” everywhere. Once saved, they also apply retroactively, because rules are assumptions, not recorded costs. Until you save something, shipping and fees are missing from the calculation.

1. 01Open Peak Profit → “Rules”.
2. 02Under “Shipping, handling, fees”, enter shipping per order, handling per order or per unit, payment fee in % and fixed, cost per return and other variable costs.
3. 03Optional: shipping per country and fees per marketplace.
4. 04Under “Cost of goods and refunds”, decide what happens with missing unit costs and refunded goods.
5. 05Save.