Documentation
Docs
Everything needed to build against the API: how to get a key, what validation actually checks, how a business is addressed on the network, and what every error means.
If you are new to e-invoicing itself rather than to this API, start with the guide. It covers the network, the document and the rules, without assuming you have met any of them.
Start
Getting started
Get a key with a sign-in, then validate your first document.
API reference
All 14 operations, rendered from the contract.
How it works
Validation
Three layers, in order, and the 1,103 rules behind them.
Participants
How a business is addressed, and how to check it can receive.
Errors
RFC 9457 problems, and the 24 types this API returns.
Rule reference
Every rule, with its official text and the fix.