If you are sending international shipments with a goods total over £270, you must attach a CN23 customs declaration with your regular shipping label. This document is used for customs clearance at the destination country.
Some international carriers provide paperless customs documents, which remove the requirement for you to complete a CN23 document. If you are not sure if your carrier offers this functionality, please get in touch with us or contact your carrier directly.
Shiptheory can automatically create CN23 documents on your behalf for eligible shipments. To enable, this functionality, please follow this guide here: http://support.shiptheory.com/support/solutions/articles/24000044841