EORI is a unique number used in the European Union for the identification of companies and individuals (economic operators — special legal status) engaged in a customs-related field in the EU. Your business can operate both in and out of the EU. Each company working with importation, exportation, or transit of goods is obliged to get this number that makes its activity legal and enables a company to work freely in an inter-economic area. Remember that you should get this number before starting your customs activity.
Evidence regarding your planned accommodation in Estonia
Any information that supports your intention to leave the Schengen area before the expiry of the visa, such as return flight tickets