You are able to edit the order lines of orders with all payment options. You can further delete, add, change an item name, reference, quantity, price, or a discount.

You are not able to increase the order amount to be more than the customer approved during the purchase. Should the amount exceed the approved amount, the order total will become red and you will not be able to select the “Save change” button.

Shipped order
You are not able to increase the amount of a shipped order, but you can of course add discounts or remove fees after an order has been sent. Find the order and select “Refund”. You are then able to register a refund up to the amount of the captured order.