This API is subject to change. Bug fixes and new features will be released based on developer feedback throughout the preview period.
This method retrieves additional fees calculated by your app.
Wix calls this method when certain actions are performed on the cart or checkout. For example, when an item is added to the cart or the amount of an item is updated in the checkout.
Note: The currency returned in the response object must match the wix site's currency or those fees will be filtered out and not returned. Extract the currency from the request envelope to ensure the correct currency is used in your calculation.