What format should the country be in? Countries when specified should be sent in ISO 3166-1 alpha-2 format, for example if the delivery address in within the UK the code: 'GB' should be sent. A full list of country codes is available here: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 I have special data that is not accounted for in your 'order' class? We can setup custom objects to recieve bespoke data from your system. Please contact your account manager with your requirements.