finaX E-Rechnung API

finaX is a self-hosted API solution designed for generating and processing electronic invoices in compliance with German and European standards, including XRechnung (UBL/CII) and ZUGFeRD 2. It offers automatic validation against official specifications, ensuring that every invoice meets the highest quality and compliance standards. Additionally, finaX provides full control over data and infrastructure, making it ideal for organizations with strict data governance requirements. The API supports both UBL and CII syntaxes for XRechnung, as well as the hybrid ZUGFeRD format, which combines PDF/A-3 for human readability with embedded XML for machine processing. This flexibility allows businesses to cater to various invoicing scenarios. Deployment is straightforward, running finaX as a Docker container, ensuring compatibility with diverse IT environments. The API accepts JSON as input, simplifying integration with existing systems and reducing the complexity of handling XML directly. With comprehensive documentation and a focus on user-friendly design, finaX enables businesses to implement electronic invoicing efficiently and confidently.