The EIA code consists of the Finnish Tax Administration's code 0037 + the business ID of the company without a dash (8 characters) and possible extension (up to 5 characters). If your company does not yet use e-invoicing and does not have an e-invoicing address, you can easily get it into use by signing up for a free Maventa account here. The EIA identifier is generated automatically and can be found in the Maventa interface under Settings > Invoice receiving.
You can search for a recipients' EIA's from the public e-invoice directory.
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