Was ist die Verifactu API?

The Verifactu API is a secure, certified interface that enables software applications to transmit and manage Verifactu data records in accordance with the requirements of the Spanish Tax Agency (AEAT). Through this API, ERP, POS, or PMS systems can automatically generate, validate, and transmit tax-related information, thereby ensuring both regulatory compliance and data integrity.

Wie integriert man Verifactu in die eigene Abrechnungs‑ bzw. Rechnungs‑Software?

Connection to the Verifactu API using secure credentials. Generation of tax-related documents or data records within the payroll software. Automatic transmission of this data to the API for validation and submission to the Spanish tax authority. Processing of responses and status messages, including retrieval of receipts and validation messages. Ongoing monitoring to ensure compliance and full traceability.

Müssen alle Unternehmen Verifactu nutzen?

Not all businesses are required to use Verifactu. However, all businesses and self-employed individuals in Spain must ensure that their invoicing systems comply with the legal requirements of the Anti-Fraud Law. There are two permitted models: Verifactu (invoice data is transmitted automatically and in near real time to the AEAT) and Non-Verifactu (no direct transmission to the AEAT).

Was passiert bei Nicht-Compliance?

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.

Was ist der Unterschied zwischen Verifactu und Non-Verifactu?

Spain distinguishes between two models for processing tax-related invoice data: Verifactu and Non-Verifactu. The key difference lies in the transmission and verification of the data. With Verifactu, invoice data is automatically transmitted to the Spanish tax authority (AEAT). With Non-Verifactu, there is no direct transmission. Instead, the data is processed within the provider’s system.

Wie funktioniert die Verifactu API?

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.

Sistema Informático de Facturación (SIF) refers to billing systems in Spain that create, process, or manage tax-relevant invoice data. For software providers, it is crucial whether their system is classified as SIF, as this determines the applicable Verifactu requirements.

Gibt es Entwicklerdokumentation für Verifactu?

Yes, the technical documentation is available on efstaDocs.

Ist Verifactu das Gleiche wie E-Invoicing?

No. Verifactu is a real-time control tool for the tax authorities. It complements the planned electronic B2B invoice (Ley Crea y Crece).

Verifactu API for Billing Systems in Spain

Who is the Verifactu API relevant for?

The efsta Verifactu API is designed for software providers, integrators, and small and medium-sized businesses whose systems create, process, or manage invoices or tax-relevant transaction data in Spain.

Providers of billing systems
Sistema Informático de Facturación (SIF) refers to billing systems in Spain that create, process, or manage tax-relevant invoices. This includes POS, ERP and other billing systems that must comply with Verifactu requirements.

POS and cash register providers
Integrate Verifactu requirements directly into existing sales processes and ensure that transaction and invoice data is processed correctly.
ERP providers
Automate the processing of tax-relevant invoice data and support your customers in meeting Spanish compliance requirements
PMS providers
Enable hospitality customers in Spain to connect seamlessly to Verifactur-related processes in a standardized way.
System Integrators
Integrate Verifactu efficiently into existing system landscapes and reduce implementation effort for customer-specific projects.

Why Software Providers need to act now

The Spanish Anti-Fraud Law (Law 11/2021) fundamentally changes how invoice processing works. Software solutions are now at the center of regulation, as they must ensure the integrity, traceability and immutability of invoice data.
For companies subject to corporate tax, compliance becomes mandatory from January 1, 2027.
For all other taxpayers, it takes effect on July 1, 2027.

The Spanish tax authority AEAT (Agencia Estatal de Administración Tributaria) classifies the period until then as a transition phase for adapting systems.

4 key requirements:

Immutability:
Each invoice must generate an individual record that cannot be altered or deleted. Corrections or cancellations always result in a new record.

Traceability (Hash Chaining)
Each record is linked to the previous one via a hash value, creating a tamper-proof chronological history.
Automated Logging
All relevant events such as creation, modification or cancellation are automatically recorded, ensuring a complete event log.
Real-time transmission
Relevant invoice data is transmitted automatically to the AEAT upon creation.

For software providers, this means:
Billing systems must not only generate data, but also process it in a structured (e.g., as XML data records), traceable, and tamper-proof manner. Systems that do not meet legal requirements can lead to significant risks and penalties. As a result, compliance becomes a central responsibility in software development.

Benefits of the efsta Verifactu API

Reliable compliance

Implement Verifactu requirements securely and reduce the risk of error-prone custom developments.

Standardized integration

Connect existing POS, ERP, PMS, and billing systems via efsta Fiscal Middleware without changing your system architecture.

Transparent validation

Technical validations and status feedback enable clear processes and early error detection.

Scalable architecture

Support additional country-specific requirements via one unified API.

Reduced development effort

efsta handles core technical tasks such as data processing, QR codes, timestamps, and transmission. This saves software providers time and resources.

Verifactu Integration: How It Works

The efsta Verifactu API connects existing POS, ERP, PMS, or billing systems with Spanish Verifactu requirements. Invoice data is transmitted to efsta via a standardized interface, processed, and prepared for compliant processing. Typical integration:

1. Submit invoice data

The connected system sends tax-relevant invoice and transaction data to efsta.

2. Validate and structure data

efsta processes the data in accordance with Spanish requirements and ensures integrity and traceability.

3. Generate Verifactu records

The solution supports the creation of Verifactu-relevant records, including technical requirements such as conversion into XML format, QR code generation, data integrity, and traceability.

4. Prepare for transmission

The relevant information is prepared for transmission to the Spanish tax authority AEAT.

5. Return status

The source system receives technical feedback and can process it within its own workflows.

6. Scalable expansion

Additional country requirements can be integrated via the efsta unified API.

Verifactu is not only a regulatory requirement but part of a broader European trend towards real-time reporting and digital tax control.

Why efsta?

efsta supports companies, software providers, and integrators in implementing country-specific fiscalization and compliance requirements. Our solutions are designed for complex system landscapes, international rollouts, and technical integrations into existing POS, ERP, and PMS systems.

Experience in international fiscalization

efsta supports compliance requirements in 17 European countries.

One interface for multiple countries

The efsta Unified API enables standardized integration for different regulatory requirements.

Designed for software providers and integrators

Our solutions are built to integrate seamlessly into existing systems and technical processes.

Technical Documentation and Project Support

Development teams are granted access to efstaDocs and receive support with the technical implementation.

Certified processes

efsta is certified to ISO 27001 and ISO 9001.