You are viewing documentation for API version 2026-05-04. The latest version is 2026-06-01.
SIGN IT in its lite version enables the creation of a commercial document and the real-time transmission of data for each individual transaction to the Revenue Agency.
In general terms, the following information is reported in the commercial document:
- the data of the taxpayer carrying out the sale,
- the detailed data of the operation: quantity, description, unit price and applicable VAT rate,
- whether the payment is collected or not at the time of issuance of the document, and
- the payment information.
SIGN IT API allows to generate transaction documents for every B2C sales operation, as well as returns and cancellations of transactions carried out through the API.
💡Tip
SIGN IT API in its lite version requires a stable internet connection, since the commercial document data must be transmitted at the time the sale is completed.