Core Admin APIReturns
Update a Shipping Method of a Return
Add a Shipping Method to a Return POST
Add a shipping method to a return. The shipping method will have a `SHIPPING_ADD` action.
Remove Shipping Method from Return DELETE
Remove a shipping method of the return by the ID of the item's `SHIPPING_ADD` action. Every item has an `actions` property, whose value is an array of actions. You can check the action's name using its `action` property, and use the value of the `id` property.