New Calls! Ability to Add Shipments Through the API

Now, users can add Shipments to a sale through the API!

Using addShipments, users can add a shipment to an existing sale in SkuVault.

Using updateShipments, users can change the status of a sale, change the amount value of the landed cost and the type of currency.

Using getShipments, users can check the parameters of a current sale.

Using setShipmentFile, users can set a single base64 PDF string to the sale.