Origin Certificate ensures preferential tariff eligibility and must follow the prescribed sample with producer sworn declaration. An Origin Certificate certifies that goods satisfy the origin requirements to obtain preferential tariff treatment and is valid for one import operation; the original must be presented to importing customs. Designated government offices in each signatory issue and control certificates, directly or by delegation. Certificates must conform to the Appendix I sample and be issued upon a sworn declaration by the final producer together with the commercial invoice, the invoice number being recorded in the certificate.