Changelog

API contract changes are listed here, newest first.

2026-09-21

• Webhooks: new event invoice.fs_rejected (Finančná správa rejected the C5 tax-data copy). It joins the default subscription for new endpoints; existing endpoints keep their stored list, add the event yourself. invoice.fs_acknowledged andinvoice.fs_rejected arrive in the efk.event.v1 envelope; see Webhooks.
• SAPI-SK: GET /sapi/document/status (eFakturuj extension) now reports the fs object from the C5 filing; fs.reportDeadline is reserved and always null. The plan-limit refusal (HTTP 402, SAPI-QUOTA-INVOICE-LIMIT) is category PERMANENT instead of the non-standard QUOTA.