Invoice123

Install this free plugin into your WordPress website, and by linking it with Invoice123 (in Lithuanian – Sąskaita123), simplify your data management process. This tool is suitable for everyone conducting online business, regardless of the business format.
Invoice123 offers seamless invoice automation and customer management for efficient online accounting. The Invoice123 system has turned the old-fashioned manual invoicing method into a digital process that’s four times faster, available online 24/7.
We provide all the necessary tools, from various integrations to connections with accounting systems or e-commerce platforms, tax calculators and more.
Invoice123 is everything businesses of various types need to make their accounting easy and straightforward. We look forward to seeing you on our platform at www.invoice123.com

Manage sales and purchases, clients, inventory, and invoices. Everything business needs is in one system.

wpdesk

vvperyk

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 <a href="https://wpdesk.link/fi-rm" rel="nofollow ugc">Flexible Invoices</a> 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 <a href="https://wpdesk.link/ksef-fi-rm" rel="nofollow ugc">Flexible Invoices PRO</a> in version 5.3.0 or higher.
<h3>Key Features</h3>
<ul>
<li>Direct invoice registration to KSeF from Flexible Invoices</li>
<li>One-click sending of individual invoices to KSeF</li>
<li>Bulk invoice registration to the National e-Invoice System (KSeF)</li>
<li>Clear KSeF status displayed in the invoice list</li>
<li>Dedicated KSeF metabox showing:
<ul>
<li>invoice registration status</li>
<li>registration date</li>
<li>KSeF reference ID</li>
<li>KSeF API error messages</li>
</ul>
</li>
<li>Integration with the official KSeF API</li>
<li>Full compatibility with <a href="https://wpdesk.link/fi-rm" rel="nofollow ugc">Flexible Invoices</a> and <a href="https://wpdesk.link/ksef-fi-rm" rel="nofollow ugc">Flexible Invoices PRO</a></li>
</ul>
<h3>How it works</h3>
<ol>
<li>Install and activate <a href="https://wordpress.org/plugins/flexible-invoices/" rel="ugc">Flexible Invoices</a></li>
<li>After installing the plugin, go to Invoices → Reports → KSeF to connect the store with the invoice system.</li>
<li>Enter your KSeF API credentials in the plugin settings.</li>
<li>Send invoices to KSeF:
<ul>
<li>individually with one click</li>
<li>in bulk using bulk actions</li>
</ul>
</li>
<li>Monitor invoice status and KSeF details directly in WordPress.</li>
</ol>
<h3>Data Use Policy</h3>
This plugin connects to the official KSeF API (provided by the Polish Ministry of Finance) to send invoices generated by the Flexible Invoices plugin.
This connection is required to send and verify electronic invoices (FA(2)).
When sending a document, the following data is transmitted: 
– Invoice data (required by law) 
– Your KSeF access token or credentials (configured in plugin settings)
This service is provided by the Ministry of Finance of the Republic of Poland: 
1. <a href="https://www.podatki.gov.pl/ksef/" rel="nofollow ugc">API documentation</a> 
2. <a href="https://www.gov.pl/web/gov/polityka-prywatnosci" rel="nofollow ugc">Privacy policy</a>
WP Desk plugins collect anonymous diagnostic and configuration data to enhance product quality, stability, and alignment with user needs. This data is securely transmitted once after plugin activation and once a week later on, to WP Desk’s servers at testsdata.wpdesk.org and data.wpdesk.org for statistical analysis, technical issue identification, and plugin performance optimization. 
All data collection is conducted anonymously, without storing personal, financial, or sensitive business information. The application does not collect data without users knowledge. Data collection requires an users opt-in through the plugin settings.
<a href="https://wpdesk.pl/sk/docs-fi-ksef" rel="nofollow ugc">Learn more about it in docs</a>

Flexible Invoices for WooCommerce – KSeF Add-on

Easily send invoices from Flexible Invoices straight to KSeF using the official Ministry of Finance API.

Invoice123 vs Flexible Invoices for WooCommerce – KSeF Add-on