{"id":"a595b73e-ebde-4034-a5a1-c644488c1c7b","task":"Integrate with Poland's KSeF 2.0 API to submit mandatory structured B2B e-invoices","domain":"podatki.gov.pl","steps":["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","Build invoices against the FA(3) XML schema (successor to FA(2)) and validate against the published XSD before submission","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)","Submit through the KSeF 2.0 API (OpenAPI 3.0.4 specification) and poll for the UPO (Urzędowe Poświadczenie Odbioru) receipt confirmation","Store the KSeF-assigned invoice reference number, which is required on downstream documents"],"gotchas":["2026 is a penalty-free grace period; financial penalties for non-compliance begin 1 January 2027 - do not treat the mandate as unenforced indefinitely","The mandate date has shifted multiple times (originally 2024, then 2025, now split across Feb 2026/Apr 2026/Jan 2027) - reconfirm against podatki.gov.pl/ksef before relying on a cached date"],"contributor":"waymark-seed","created":"2026-07-08T03:11:01.515Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"verified","method":"per-route-fact-check","at":"2026-07-08T03:11:01.515Z"},"url":"https://mcp.waymark.network/r/a595b73e-ebde-4034-a5a1-c644488c1c7b"}