Flexible Invoices for WooCommerce – KSeF Add-on

2.5.4 – 2026-10-28

Fixed correction invoices that change the buyer. The XML now includes Podmiot2K with the buyer from the corrected invoice.

Changing the buyer’s tax identifier is not supported. FA(3) requires that invoice to be corrected down to zero and a new invoice to be issued.

2.5.3 – 2026-10-13

KSeF metabox is no longer visible for unpublished documents.

2.5.2 – 2026-10-07

Added support for WooCommerce 11.2

2.5.1 – 2026-10-05

Removed KursWalutyZK from XML payload for correction documents.

Fixed KSeF generation for non-EU buyers charged Polish VAT (e.g. US). Such sales are reported as domestic VAT and are no longer rejected as OSS.

2.5.0 – 2026-10-05

Added KSeF certificate authentication as an alternative to the API token.

2.4.12 – 2026-09-14

Fixed Podmiot2 for EU buyers: KodUE is used only when VIES confirms the VAT number.

Fixed WDT, NP II and OSS mapping so they follow the same VAT-UE check.

Fixed OSS/WSTO_EE tagging for EU B2C invoices that use Polish VAT (e.g. event tickets). Such sales are now reported as domestic VAT, not OSS.

2.4.11 – 2026-08-19

Fixed problem with negative values being wrongly passed as positive in correction invoices

Items with the same name no longer merge into one.

2.4.10 – 2026-08-18

Added support for WordPress 7.1

Added support for WooCommerce 11.1

2.4.9 – 2026-08-10

Fixed KSeF XML schema validation for Greece by mapping the EU VAT country code to EL.

2.4.8 – 2026-08-03

Fixed problem with missing tax summary for WS