Exchange key (cserekulcs) used to decrypt the exchange token.
Technical user login, 6–15 alphanumeric characters.
Technical user password, in clear; it is hashed before transmission.
Signature key (aláírókulcs) used to sign requests.
Tax number of the taxpayer being reported for, 8 digits, no VAT suffix.
Credentials of a technical user (technikai felhasználó), created in the Online Számla portal under the taxpayer whose data is being reported.
These are secrets. Load them from the environment or a secret manager — never from source control — and note that the test and production systems issue separate, non-interchangeable users.