With our unified API , document data is automatically converted into a legally compliant XML format and securely transmitted to the tax authority AEAT (Agencia Estatal de Administración Tributaria) in real time.
This means that companies reliably meet the requirements of the Spanish anti-fraud law (Ley 11/2021) and are fully compliant at all times.
efsta's middleware acts as a central interface for different tax requirements - in Spain with Verifactu as well as in other countries.
It integrates seamlessly into existing systems so that no system change is necessary and the implementation effort remains minimal.


The Spanish government has introduced a new standard for invoicing software with Royal Decree 1007/2023.
The aim is to combat the shadow economy, which is estimated to be worth 200 billion euros. From now on:
Only with a Verifactu-compliant system can companies avoid penalties and operational risks.
Our systems are designed to transfer tax-relevant data securely and efficiently to the Spanish authorities.
Existing ERP and POS systems can be connected via our middleware. No costly new development necessary.
Immediate feedback ensures maximum transparency and minimizes sources of error.
As Europe increasingly relies on real-time reporting (Italy, Portugal, France), Verifactu is the logical step towards digital tax transformation.
Our API takes care of the technical requirements such as XML creation, QR code, time stamp and transmission - saving you time and resources.

The deadlines are binding and require timely preparation:
Anyone who ignores these deadlines risks fines of up to €150,000 per year.
Conclusion: Only Verifactu offers maximum security, transparency and sustainability.
Take advantage of our free initial consultation and find out how you can adapt your software to Spanish requirements with minimal effort.
The Verifactu API is a secure, certified interface that enables software applications to submit and manage Verifactu data records in accordance with the requirements of the Spanish Tax Agency (AEAT).
Using this API, ERP, POS, or PMS systems can automatically generate, validate, and transmit tax-related information, thereby ensuring both regulatory compliance and data integrity.
Verifactu is integrated via the efsta API, which provides clear endpoints for submitting, validating, and tracking data records.
A typical integration process includes:
The official efsta documentation provides practical examples and guides to help you integrate the system quickly and reliably.
Yes - all companies and self-employed persons who issue invoices in Spain are affected. Only companies in the SII system are exempt from the transmission obligation, but must still meet the technical requirements (integrity, traceability, immutability).
Penalties of up to €150,000 per year for manufacturers and up to €50,000 for companies. There is also the threat of reputational damage and tax risks.
The API takes receipt data from your ERP or POS, automatically creates the prescribed XML data record with hash chain, time stamp and QR code and transmits it to the AEAT in real time. The data is then archived and can be exported at any time.
Yes. efsta provides comprehensive developer documentation that explains in detail how to integrate the Verifactu solution via our API.
The documentation includes descriptions of endpoints, data structures, validations, recommended workflows, and practical integration examples.
You can access the official documentation here: efstaDocs
No. Verifactu is a real-time control tool for the tax authorities. It complements the planned electronic B2B invoice (Ley Crea y Crece).