After an order is paid, you can edit it by adding items, removing items, and adjusting item quantities. Edit an order if a customer wants to change an item or if you need to add or remove an item. For example, a customer might want to change the size or color of an item on their order.
The total cost of an order is updated as the order is edited. If the cost of the order changes, then you need to charge or refund your customer the cost difference.
Check the other articles on how you can add or remove items and adjust item quantities.
NOTE: You can edit an order only if it was placed less than 60 days ago.