Update Inbound Shipping Method of a Claim

Add an Inbound Shipping Method to a Claim POST

Add an inbound (or return) shipping method to a claim. The inbound shipping method will have a `SHIPPING_ADD` action.

Remove Inbound Shipping Method from Claim DELETE

Remove the shipping method for returning items in the claim using the `ID` of the method's `SHIPPING_ADD` action. Every shipping method 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.