Report configured KSeF environment and auth state without exposing secrets.

Authenticate to KSeF TEST and persist readiness before invoice XML generation.

Report supported, advisory, unsupported, and manual-smoke workflow capabilities.

Query KSeF invoice metadata for a date range and role.

Fetch a KSeF invoice by reference number.

Retrieve invoice or session UPO for a known KSeF session.

Check whether the current KSeF context may issue invoices with FA(3) attachments.

Validate a Polish NIP checksum.

Validate FA(3) XML against the vendored official XSD.

Look up advisory counterparty data from MF, VIES, KRS, or GUS sources.

Fetch official NBP exchange-rate data; advisory and requires basis confirmation.

Suggest the advisory NBP average rate for a VAT exchange-rate basis date.

Suggest advisory VAT treatment candidates and missing facts; never mutates drafts.

Store a local source document and index it for advisory retrieval.

Search local source documents; returned matches are advisory provenance only.

Use a local LLM to propose source-backed invoice fields without mutating drafts.

Attach source-backed field provenance to a draft and require confirmation.

Create an invoice draft and return the missing-field checklist.

Update an invoice draft with user-provided facts or confirmations.

Validate invoice draft completeness before XML preparation.

Build and validate invoice XML without sending; refuses until TEST readiness passes.

Render a local KSeF-like PDF from prepared FA(3) XML without sending to KSeF.

Irreversibly issues a legally binding invoice to KSeF. Requires a confirmation_token from ksef_prepare_invoice.