For the purposes of claiming the preferential tariff treatment for an originating good of the exporting Party, a certificate of origin is submitted to the customs authority of the importing Party by the importer, together with the documents required for the importation of the good in accordance with the laws and regulations of the importing Party.
The details regarding certification and verification are set out in the individual FTA provisions.
International Trade Law includes the appropriate rules and customs for handling trade between countries. However, it is also used in legal writings as trade between private sectors, which is not right.
This branch of law is now an independent field of study as most governments has become part of the world trade, as members of the World Trade Organization (WTO).
Since the transaction between private sectors of different countries is an important part of the WTO activities, this latter branch of law is now a very important part of the academic works and is under study in many universities across the world.