A cattle registration office or a livestock inspector requests for the animal passport. It can be at national or international level.
The cattle registration office or the livestock inspector send a request for animal passport data to the cattle regsitration office where the animal comes when the animal comes from another country.
Harmonization of the relevant code lists is necessary. It's also important to take care of the animal identification number.
It's possible to use the UN/CEFACT standard.