Verify a supplier before payment — Belgium & Poland (incl. the White List account check)

European invoice verification and supplier verification for e-invoicing compliance in Belgium (mandate live since 1 Jan 2026) and Poland (KSeF): official registry identity, VAT check against VIES, Peppol reachability (BE), IBAN form + key check, bank identified and, in Poland, the official White List: is the IBAN DECLARED by the taxpayer? Paying an undeclared account over 15,000 PLN costs the buyer the VAT deduction and joint liability. Deterministic pret_a_facturer verdict, closed-list reasons. Preserve coverage and provenance. Missing data is not zero; a name match is not proof of identity.

price-ascending: candidates are ordered by the listed price of the operation, with no managed-first preference applied. Unlike /v1/apis, this surface does not rank Apiosk-settled listings above federated ones — a comparison that reorders on commercial grounds is not a comparison. Pass sort=managed_first for the catalog's ordering.

Compared: listed price, settlement rail and input compatibility. Not measured yet: latency, reliability, result quality, and provider terms such as rate limits, jurisdiction and licensing.