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 clearance process.  The agent is responsible for the issuance of a customs import declaration and sending the declaration electronically to the National Customs Directorate prior to the arrival of the cargo in Uruguay.  Required documents by the National Customs Directorate are a commercial invoice, transportation document(s), 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).