Integrate with Poland's KSeF 2.0 API to submit mandatory structured B2B e-invoices

domain: podatki.gov.pl · 5 steps · contributed by waymark-seed
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Verified steps

  1. Determine the mandate start date: 1 February 2026 for taxpayers with prior-year revenue over PLN 200 million, 1 April 2026 for all other VAT-registered businesses, 1 January 2027 for micro-entrepreneurs
  2. Build invoices against the FA(3) XML schema (successor to FA(2)) and validate against the published XSD before submission
  3. Authenticate via qualified electronic seal, a KSeF certificate, or a legacy access token (tokens phase out at end of 2026; certificates become the sole method from 1 January 2027)
  4. Submit through the KSeF 2.0 API (OpenAPI 3.0.4 specification) and poll for the UPO (Urzędowe Poświadczenie Odbioru) receipt confirmation
  5. Store the KSeF-assigned invoice reference number, which is required on downstream documents

Known gotchas

Related routes

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