Flexible Invoices for WooCommerce – KSeF Add-on
Easily send invoices from Flexible Invoices straight to KSeF using the official Ministry of Finance API.
4(1 reviews)
·300 active installs·Updated 5 days agoAs of April 2026, Flexible Invoices for WooCommerce is a WordPress ksef plugin with 300 active installations and a 4/5 rating from 1 reviews. It has been downloaded 3.5K+ times in total. Requires WordPress 6.4+ and PHP 7.4+. Available on WordPress.org since 2025. Actively maintained — updated within the last month. Support resolution rate: 25%.
4/51 reviews
300active installs
25%resolved
1 yearsince 2025
Overview
KSeF – invoice registration from Flexible Invoices is a WordPress plugin that lets you send invoices directly to KSeF (Polish National e-Invoice System). It works as an extension for Flexible Invoices and uses the official KSeF API provided by the Polish Ministry of Finance.
The plugin allows you to submit invoices from WordPress and WooCommerce straight to KSeF, without exports or external systems. invoice status, KSeF reference numbers, and error messages are all available inside the WordPress dashboard.
This plugin is an add-on for Flexible Invoices and therefore requires the Flexible Invoices plugin in min. version min. 6.2.0.
If you also want to use automatic invoice generation, or issue invoices in the OSS standard, opt for the Flexible Invoices PRO in version 5.3.0 or higher.
Screenshots
Ratings & Reviews
41 reviews
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Compatibility
| WordPress | 6.4+ requiredTested up to 6.9.4 |
| PHP | 7.4+ required |
Frequently Asked Questions
Changelog
2.2.1 – 2026-03-30
- Fixed problem with prefixed vat numbers. Plugin now automatically removes prefix from entered vat numbers when needed.
Contributors
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.