TRESO2 Public API

API Version 2

The stable API version for invoice management, supporting invoices, credit notes, customers, suppliers, and more.

Invoice & Credit Note management
Customer & Supplier management
Purchase Orders & Receipt Slips
Document attachments
Business Units & Validators
Custom Fields support

View V2 Documentation

API Version 3

The next-generation API with enhanced compliance for the French E-Invoicing Reform (EN16931).

EN16931 compliance for French e-invoicing
Enhanced invoice validation
Improved data structures
Better error handling
Streamlined endpoints
All V2 features included

View V3 Documentation

Authentication

OpenID Bearer Token (OAuth2)

TRESO2 API uses bearer token authentication via OpenID Connect (OAuth2 Password Grant).

You need API dedicated credentials - Your TRESO2 application login credentials do not work for API access
Tokens have a short lifetime and must be refreshed regularly
No client secret required (public client)

For complete authentication details including token endpoints, code examples, and interactive testing, see the Authentication section in the API documentation:

For detailed OAuth2 documentation, see: OAuth 2.0 Password Grant