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KSeF Pro — Installation Guide (WooCommerce)

KSeF Pro for WooCommerce connects your WordPress store to Poland's national e-invoicing system, KSeF (Krajowy System e-Faktur). The plugin generates FA(2) XML invoices, signs them with XAdES-BES digital signatures, and submits them to the Ministry of Finance API — keeping your store compliant with Poland's mandatory e-invoicing requirements without manual intervention.

What is KSeF?

KSeF (Krajowy System e-Faktur) is the Polish government's mandatory electronic invoicing infrastructure. Every B2B VAT invoice issued by a Polish taxpayer must be submitted to KSeF and receive a unique KSeF-ID — a government-assigned identifier that becomes the permanent official record of the transaction for VAT purposes.

Key facts about the mandate:

  • Active for large VAT payers, phased rollout to all Polish VAT payers
  • Applies to B2B domestic transactions; B2C invoices are optional but recommended
  • FA(2) schema version 2.0 mandatory from April 2026
  • KSeF-IDs must be retained for 5 years
  • Non-compliance carries financial penalties per the Polish VAT Act

For a full explanation of the KSeF authentication flow and session lifecycle, see the KSeF Connection page.

Requirements

| Requirement | Minimum | Recommended | |---|---|---| | WordPress | 6.3 | 6.7 | | WooCommerce | 8.0 | 9.4 | | PHP | 8.1 | 8.3 | | PHP extensions | cURL, OpenSSL, SimpleXML | — | | MySQL | 5.7 | 8.0 | | KSeF account | Active token from the MF portal | — | | NIP | Valid Polish tax ID registered in KSeF | — | | WP-Cron | System cron recommended | wp cron event run |

Verify PHP Extensions

php -m | grep -E "curl|openssl|simplexml"

All three must be present. If any is missing, contact your hosting provider — these are standard extensions available on all major PHP-capable hosts.

Memory Requirement

FA(2) XML generation and XAdES-BES signing are memory-intensive for large orders with many line items. Ensure PHP memory limit is at least 128 MB:

php -r "echo ini_get('memory_limit');"

If below 128 MB, increase in wp-config.php:

define('WP_MEMORY_LIMIT', '256M');

HPOS Status

KSeF Pro supports both legacy (wp_postmeta) and HPOS (wc_orders_meta) order storage. The plugin detects the active storage mode automatically — no configuration needed.

HPOS orders list with KSeF-ID column visible after activation

If you plan to migrate to HPOS after installing KSeF Pro, use the built-in WooCommerce migration tool (WooCommerce → Settings → Advanced → Features → Data synchronisation). KSeF-IDs and audit log entries are preserved during migration.

Step 1: Download the Plugin

After purchasing KSeF Pro on plugkit.io, a download link is emailed within a few minutes. Download ksefpl-woocommerce.zip.

Do not unzip it. WordPress handles extraction automatically.

To re-download, log in to plugkit.io → My Account → Orders → click the download link.

Step 2: Upload via WordPress Admin

  1. Log in to WordPress Admin → Plugins → Add New Plugin
  2. Click "Upload Plugin" at the top
  3. Select ksefpl-woocommerce.zip and click "Install Now"
  4. After installation, click "Activate Plugin"

After activation, the plugin appears in your Plugins list as "KSeF Pro — National e-Invoicing for WooCommerce" with status Active.

What Gets Installed

| Component | Details | |---|---| | Plugin files | wp-content/plugins/ksefpl-woocommerce/ | | Database tables | {prefix}_ksefpl_queue (submission queue), {prefix}_ksefpl_audit (audit log), {prefix}_ksefpl_sessions (session tracking) | | WP options | ksefpl_* keys in wp_options (encrypted token, seller data, settings) | | XML storage | wp-content/uploads/ksefpl-xml/ (auto-created with .htaccess protection) | | UPO storage | wp-content/uploads/ksefpl-upo/ (auto-created with .htaccess protection) | | Cron jobs | 4 WP-Cron events registered: ksefpl_process_queue, ksefpl_poll_status, ksefpl_download_upo, ksefpl_retry_failed | | WooCommerce hooks | woocommerce_order_status_changed, HPOS equivalent hooks | | Admin menu | WooCommerce → KSeF Pro |

Storage Directory Permissions

The XML and UPO upload directories require write permissions for the web server user:

ls -la wp-content/uploads/ | grep ksefpl

Both directories should show the web server user (www-data on Debian/Ubuntu, nginx on CentOS) as owner. If created with wrong ownership:

chown -R www-data:www-data wp-content/uploads/ksefpl-xml
chown -R www-data:www-data wp-content/uploads/ksefpl-upo

The .htaccess files in these directories block direct URL access — do not delete them.

Step 3: Obtain Your KSeF Token

Test Token (Start Here)

  1. Go to https://ksef-test.mf.gov.pl
  2. Log in with Qualified Electronic Signature (QES), Trusted Profile (Profil Zaufany), or seal certificate
  3. Navigate to Tokeny → Generuj token
  4. Select scopes: Wystawianie faktur (invoice_write) and Dostęp do faktur (invoice_read)
  5. Copy the token — it is shown only once

The test environment is a full-fidelity replica of production. Use it to validate your entire configuration before going live.

Production Token

Follow the same steps at https://ksef.mf.gov.pl. Before generating a production token, verify your NIP is active: navigate to Sprawdź status NIP on the portal. New companies or recently re-registered entities may have a delay of 1–2 business days before activation.

Token Scope Warning

A token missing invoice_read scope will submit successfully but silently fail during UPO download. Your audit log will show orders stuck in SUBMITTED status indefinitely. Always generate tokens with both invoice_write and invoice_read.

Step 4: Configure the Plugin

After activation, go to WooCommerce → KSeF Pro. The settings screen opens on the KSeF Connection tab.

KSeF Pro WooCommerce connection settings

Minimum required settings before testing:

  1. Select Test environment
  2. Paste your test token
  3. Go to Seller Data tab and enter your company NIP and address
  4. Click "Verify connection" — green indicator confirms the NIP/token pair is valid

Proceed to the Configuration guide for full settings documentation.

Step 5: Set Up WordPress Cron

KSeF Pro uses WordPress cron for all background tasks: queue processing, UPO polling, and failed submission retries.

The default HTTP-triggered wp-cron is not reliable for production use. On low-traffic sites it may not run for minutes or hours, causing orders to stay in PENDING status indefinitely.

Recommended: System Cron with WP-CLI

# Step 1: Disable the HTTP wp-cron trigger
# Add to wp-config.php:
define('DISABLE_WP_CRON', true);
 
# Step 2: Add a real cron entry (crontab -e)
*/5 * * * * cd /var/www/yoursite && wp cron event run --due-now --quiet 2>&1 | logger -t wp-cron

This runs all due WordPress cron events every 5 minutes, unconditionally. The logger command sends output to syslog for monitoring.

Alternative: wget/curl Approach

*/5 * * * * wget -q -O /dev/null "https://yourstore.pl/wp-cron.php?doing_wp_cron" 2>&1

Less reliable than WP-CLI because it depends on HTTP response time. Use only if WP-CLI is unavailable.

Verify Cron is Working

After setting up system cron, trigger it manually and check the log:

wp cron event run ksefpl_process_queue
tail -20 wp-content/uploads/ksefpl-logs/ksefpl-$(date +%Y-%m-%d).log

You should see log entries showing queue processing. If the log file is empty after running, enable Debug logging in KSeF Pro → Advanced → Logging Level.

Step 6: Verify with a Test Submission

  1. Place a test order in your WooCommerce store (use a test payment gateway)
  2. Move the order to the configured trigger status (default: Processing)
  3. Run the cron manually: wp cron event run ksefpl_process_queue
  4. Check WooCommerce → KSeF Pro → Audit Log — the order should appear with status SUBMITTED
  5. Run the poll cron: wp cron event run ksefpl_poll_status && wp cron event run ksefpl_download_upo
  6. Refresh the audit log — status should change to ACCEPTED with a KSeF-ID
  7. Open the order detail — the KSeF Pro meta box should show the KSeF-ID with a download link for the UPO

Updating the Plugin

When a new version is available:

  1. Download the updated ksefpl-woocommerce.zip from plugkit.io
  2. Go to Plugins → Add New Plugin → Upload Plugin
  3. Upload the new ZIP and confirm the upgrade prompt

All KSeF-IDs, audit log entries, UPO files, and configuration are preserved across upgrades. If the upgrade includes a database schema change, the migration runs automatically on the first admin page load after update.

After upgrading, clear the WordPress object cache and verify the plugin version in Plugins → KSeF Pro.

Multisite Installations

KSeF Pro supports WordPress Multisite with per-site activation:

  • Activate the plugin at the network level to make it available to sub-sites, or per-site
  • Each sub-site has its own KSeF token, seller NIP, and configuration
  • Cron events are registered per-site — each site runs its own queue independently
  • If multiple sub-sites share the same legal entity NIP, they share the same KSeF account and KSeF-ID sequence

Post-Installation Checklist

  • [ ] Plugin active in Plugins list
  • [ ] XML and UPO directories exist and are writable
  • [ ] .htaccess blocks present in XML and UPO directories
  • [ ] System cron configured (not HTTP wp-cron)
  • [ ] Token verified — green indicator in KSeF Connection tab
  • [ ] Seller NIP matches the NIP on the KSeF token
  • [ ] Tax class → VAT code mapping complete
  • [ ] Trigger status configured (default: Processing)
  • [ ] Test order submitted and ACCEPTED in audit log
  • [ ] UPO downloaded and contains valid KSeF-ID
  • [ ] FA(2) XML reviewed — buyer and seller data correct

Next Steps

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Este tema también está disponible para otras plataformas:

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