Do you store the VAT numbers I validate?

Your own checks are recorded as your audit history — the result, company details, and verifiedAt timestamp — accessible via the API and dashboard for as long as your account is active, so you can prove a check happened at the time of a transaction. vatnode doesn't build an archive of third parties' checks beyond your own audit records. You can export or delete your records; details and retention are covered in the privacy policy and DPA.