 Sometimes, there is no prescribed form, which means the exporter or the manufacturer is allowed to simply provide a (sworn) declaration about the origin of the goods.The declaration may either be made on a separate document, or incorporated in another trade document, such as an invoice.Where third-party certification is required, normally the certificate of origin must be signed by the exporter or the manufacturer, and countersigned by a local issuing body, such as a chamber of commerce or a customs authority.