Poland KSeF E-Invoicing for Business Central

Poland's mandatory e-invoicing through KSeF (Krajowy System e-Faktur) changes how every VAT-registered business issues and receives invoices. This is not an off-the-shelf AppSource download — it is a build-to-order AL extension that ECOSIRE designs, builds, and installs directly into your Dynamics 365 Business Central environment, then supports as the schema and API evolve.

We deliver it as a per-tenant extension (or an AppSource-technical-type package where you prefer), so it lives inside your tenant without forcing you onto a generic, one-size-fits-all connector. The extension maps your posted sales invoices and credit memos to the FA(3) structured XML schema using AL table and page extensions over the standard Sales Invoice Header/Sales Cr.Memo Header records, validates them, and submits them to the KSeF gateway.

What the extension does on your tenant

Submission runs through a job queue entry so invoices flow to the Ministry of Finance KSeF API automatically after posting — or on demand from a Role Center action. The extension authenticates with your KSeF authorization token or qualified certificate / seal, stored securely using isolated storage, retrieves the UPO (Urzędowe Poświadczenie Odbioru) confirmation, and writes the assigned KSeF reference number back onto the document. Inbound invoices issued to your NIP are pulled from KSeF on a schedule and staged for review.

Every API call, status transition, and UPO is logged to a dedicated ledger table for audit. We wire permission sets, retry/backoff handling, environment-aware endpoints (test vs production KSeF), and — where it helps your finance team — surface status in Power BI or Dataverse via the Business Central OData/REST API.

ECOSIRE scopes the build against your actual posting flows, delivers it on an honest lead time, and stays on for updates as KSeF specifications change.