Overview

SIGN PT at a glance

Requirement	Details
QR code	Mandatory since 2022. Each invoice must include a QR code containing structured fiscal data.
ATCUD	Mandatory since 2023. A unique document identifier composed of the series validation code assigned by AT and the sequential invoice number within that series.
Certified software usage	Invoices must be issued through a software component that complies with AT requirements.
SAF-T reporting	Businesses must regularly report invoicing data, usually monthly, in SAF-T format, depending on volume and the applicable tax regime.
Qualified Electronic Signature (QES)	Optional until 31 December 2026. Mandatory from 1 January 2027 for non-EDI invoices.

💡Unified API

SIGN PT is built on the Unified API — fiskaly’s multi-country architecture. Integrate SIGN PT once, and adding Italy, France (or Sweden when available) means changing the payload schema, not rewriting your integration. See The Unified API for the shared resource model, headers, and terminology.

What is SIGN PT?

SIGN PT is fiskaly’s fiscalisation API for Portugal. It exposes the endpoints needed to make your ERP, POS, or invoicing system compliant with Portuguese certified billing requirements through a single integration.

Via the API you can register and manage document series with the Autoridade Tributária (AT), sign and chain fiscal documents, generate ATCUD and QR code data, and submit documents to the AT either in real time through Web Services (WFA, WDT) or via monthly SAF-T (PT) XML exports.

Supported document types include Simplified Invoices (FS), Invoice-Receipts (FR), Standard Invoices (FT), Credit/Debit Notes (NC/ND) with Proof of Payment (RG / RC) and Transport Guides (GT, GR) coming soon.

Optional long-term archiving is available through the fiskaly SAFE service, and the API is designed to extend to upcoming requirements such as qualified electronic signatures (QES) on PDF invoices.

Invoice compliance

All fiscally valid documents must include at least:

• Issuer details, including name, address, and Portuguese NIF
• Invoice number and series
• ATCUD
• QR code
• Customer identification when required
• Description of goods or services
• VAT rates, amounts, and exemption codes
• Total amounts
• Date and time of issuance
• Certified software reference: Processado por programa certificado n.º ...
• Signature or hash information when applicable
• Any legally required wording depending on document type

Additional obligations

• Documents must be archived for 10 years
• The series must be registered with AT before use
• In case of system failure, companies must use pre-printed invoices and later report them
• Failure to comply may result in fines, rejected documents, or audit issues

💡Implementation takeaway

Portugal compliance is not only about invoice rendering. Your system also needs operational support for series registration, reporting, and long-term document retention.