15 November 2018
CartsOrders
Shipping Zones now have a user defined 
key attribute. The key attribute is used when creating or updating a ShippingMethod to identify a Zone.- [API] Added the 
keyattribute on theZoneandZoneDraftrepresentations. - [API] You can now get, update, and delete a Shipping Zone by its key.
 - [API] When creating a 
ShippingMethod, the Shipping Zone can be referenced by its ID or its key. - [API] 
addShippingRate,removeShippingRate,addZone, andremoveZone, can now reference a zone by its ID or its Key.