finaX API Documentation

finaX API is a simple REST API that allows you to easily create and read XRechnung (UBL/CII) and ZUGFeRD documents.

Create ZUGFeRD documents that are PDF/A-3 conformant no headaches with PDF/A-3 validation.

We don't store any of your invoice data. All data is processed in-memory, nothing is written to disk or any database.

We optimized the API for speed. We are responding in milliseconds, so you can generate invoices on the fly.

We use state-of-the-art infrastructure to ensure that our API is always available.

Our documentation is modern, easy to read, and always up-to-date. We provide guides, tutorials, and an extensive API reference.