STET PSD2 API

The STET PSD2 API is an alternative European open banking standard developed by STET (Systèmes Technologiques d'Échange et de Traitement), the French payment system operator. While the Berlin Group NextGenPSD2 is the dominant European standard, STET has developed its own specification used primarily by French banks and some institutions in other markets.

The STET standard defines APIs for Account Information Services, Payment Initiation Services, and Confirmation of Availability of Funds in compliance with PSD2. It uses HTTP/REST with JSON payloads and supports eIDAS certificates for TPP identification.

The standard is characterised by its focus on the French banking market's specific requirements, including support for SEPA Instant Credit Transfer and French domestic payment instruments. It provides detailed specifications for SCA flows and consent management tailored to French regulatory requirements.

While less widely adopted than NextGenPSD2 across Europe, the STET standard remains significant as it is used by major French banking groups including BNP Paribas, Crédit Agricole, and Société Générale.