What happens with the shipping rates and custom duty fees when a customer adds or removes an item from the shopping cart?

When an order in the shopping cart changes, the FlavorCloud application will automatically recalculate and update the shipping rates and custom duty fees and display the updated rates in the checkout cart for your customer to select. If a customer already has chosen a shipment service level (standard, express) in the checkout, the same service level is selected when a change is made to the order by the customer (e.g. if a customer adds or removes an item). That said, the customer can change the service level if they choose to do so.