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Featured Product FlexExt

FlexExt Company Lookup for GUS (Free) for WordPress

Product Code: FLX-WP-GUS-LOOKUP-FREE • Availability: In Stock

FlexExt Company Lookup for GUS (Free) for WordPress
Key Highlights & Features
Premium Quality Guaranteed
Fast & Secure Delivery
100% Encrypted Checkout
24/7 Dedicated Support
$0.00
Best Price & Quality Guarantee
Live Interactive Demo Admin: demo / demo
OpenCart 4.x Live
Storefront Demo Admin Panel
OpenCart 3.x Live
Storefront Demo Admin Panel
256-bit SSL Encrypted Checkout
Instant Official Support
100% FREE COMMUNITY EDITION (v1.0.2) GPLv2+ Open Source WordPress 6.0 - 7.1+ & HPOS Ready

Automated Polish NIP Lookup & White List (MF) Checkout Autofill

Streamline B2B checkout for Polish stores. Automatically validates 10-digit NIP checksums (Modulo 11), queries the official Polish Ministry of Finance White List API (wl-api.mf.gov.pl), and populates Company Name, Street Address, Postal Code (XX-XXX), and City.

Included Free Edition Capabilities
  • Polish NIP Modulo 11 Validation: Instant client-side and server-side mathematical checksum verification ([6, 5, 7, 2, 3, 4, 5, 6, 7]).
  • One-Click & Auto-Lookup Company Autofill: Populates Company Name, Street Address, Postal Code, and City in the billing form.
  • Smart Polish Address Parser: Splits combined single-line official registry address strings into street, postal code (XX-XXX), and city.
  • HPOS & Checkout Blocks Ready: Native compatibility with High-Performance Order Storage and block/classic checkout templates.
  • Order Metadata & Email Integration: Saves NIP, registry verification status, and official Request ID in order metadata.
  • 24-Hour Transients Caching & Live Diagnostics Tool: Minimizes external API queries and includes a built-in admin connectivity tester.
Need EU VIES Cross-Border VAT Lookup & 0% VAT Reverse Charge?

Check out the full commercial edition: Auto-GUS (Biała Lista MF) & VIES Checkout Filler PRO ($35).

v1.0.2 (2026-11-02) WordPress.org Compliance & Asset Architecture Update
  • WordPress.org Directory Compliance: Renamed Free Community Edition to FlexExt Company Lookup for GUS (flexext-gus-company-lookup) and documented external Ministry of Finance API services in readme.txt.
  • Enqueued CSS & JS Assets: Extracted all inline styles and admin scripts into standalone enqueued assets (assets/checkout-nip.css, assets/admin-settings.css, assets/admin-settings.js).
  • PHP 7.4 - 8.3+ Compatibility: Replaced PHP 8+ string helper calls with universal PHP 7.4 compatible checks and cleaned plugin header metadata.
v1.0.0 Initial Release
  • Official Polish White List (MF) Integration: Real-time lookup from wl-api.mf.gov.pl with 10-digit Modulo 11 checksum validation.
  • Automated Address Parsing Engine: Splits registry addresses into street, house/apartment number, postal code (XX-XXX), and city.
  • HPOS & Blocks Compatibility: Full declared support for Custom Order Tables and Checkout Blocks.