nav_online — overview

NAV Online Számla real-time invoice reporting for Hungarian clinics (issue #341). Official module, installable/removable, country HU on the BillingComplianceHook seam.

Issued invoices and credit notes are snapshotted as Online Számla 3.0 InvoiceData XML into a queue at issue time (no network in the request); a scheduled worker exchanges a token, submits manageInvoice operations and polls queryTransactionStatus until NAV reports DONE or ABORTED. Sandbox (test) and production environments; technical-user credentials encrypted at rest.

Deep-dive: docs/modules/nav_online.md. Module notes: the module CLAUDE.md.