Only commercial firms, industrial firms, or individuals listed in the registry of importers may legally import products into Uruguay.  A pro-forma invoice is required to start import procedures, and importers must use an agent to handle the customs entries.  The agent is in charge of issuing a customs import declaration and sending it electronically to the National Customs Directorate before the cargo arrives to Uruguay.  Required documents by the National Customs Directorate are a commercial invoice, transportation document, and a certificate of origin.  The importer also commonly requests a packing list, identifying where different units are located within the shipment.  The country may require other certificates depending on the type of product (HS Code).