From January 1, 2026, eRačun becomes mandatory for all Croatian VAT payers in the B2B segment. 4b2b issues, receives and validates eRačun via the FINA Mojcert API in UBL 2.1 format, supports SOAP and REST integration, and automatically generates a PDF rendition for visual review.
Fiscalization 2.0 is mandatory from 2026 — how to integrate quickly?
Mojcert API integration is ready: register with your digital certificate (FINA, AKD or HOK) and the platform calls the endpoints for sending, receiving, status, and retrieval automatically.
Client wants UBL 2.1 but your ERP exports CSV.
CSV→UBL 2.1 converter built in. Field mapping with NACE Rev. 2 → NKD 2007 + VAT code → UBL TaxCategoryID standard.
Received eRačun has invalid partner OIB — what now?
On receipt, OIB validation (modulo 11) runs automatically. If it fails, the eRačun is returned to the sender with a reason; it does not enter the URA ledger.
You need a visual rendition for management signoff.
PDF render automatic from UBL: Croatian language, Šahovnica watermark, all fields per Tax Administration standard (invoice number, OIB, dates, VAT rates, totals).
The entire 4b2b ecosystem is built for the Croatian market — from eRačun via FINA Mojcert to JOPPD and OIB validation.
