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Vatigo – EU VAT Validator

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Vatigo – EU VAT Validator

by Stephan

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Description

Vatigo – EU VAT Validator adds EU VAT ID validation to your WordPress forms with zero configuration. Install, activate, done.

Features

  • Pattern validation for all 27 EU member states
  • Works with Contact Form 7, WPForms, and Fluent Forms
  • Real-time inline feedback while the user types (WPForms)
  • Server-side validation on every submission
  • Custom error messages via settings page
  • Clean settings page showing active integrations and hooks used
  • Extensible: register custom integrations for any other form plugin
  • No external API calls – fully offline (free version)
  • GDPR-friendly: no personal data stored or transmitted

Supported Countries

AT, BE, BG, CY, CZ, DE, DK, EE, EL, ES, FI, FR, HR, HU, IE, IT, LT, LU, LV, MT, NL, PL, PT, RO, SE, SI, SK

Usage with Contact Form 7

Add [uid_vat uid-field] or [uid_vat* uid-field] (required) to your form template.

Example with placeholder:

[uid_vat* eu-vat-id placeholder "e.g. ATU12345678"]

Usage with WPForms

Drag the EU VAT ID field from the field panel into your form. The field supports required validation, custom labels, placeholder text, and real-time inline feedback while the user types.

Usage with Fluent Forms

Drag the EU VAT ID field from the General Fields section into your form.

Styling the inline feedback

WPForms shows real-time validation feedback next to the field. To hide it, add this to your theme’s CSS:

.vatigo-feedback { display: none; }

For Developers

Register integrations for any other form plugin:

add_action( 'vatigo_register_integrations', function( $manager ) {
    $manager->register( new My_Custom_Integration() );
} );

Your class must extend Vatigo_Integration_Base and implement all abstract methods.

  1. Upload the plugin folder to /wp-content/plugins/
  2. Activate via Plugins Installed Plugins
  3. Go to Settings EU VAT Validator
  4. Enable integrations for the forms you use
  5. Add the EU VAT ID field to your forms
Does this call an external API?

No. The free version validates patterns only, entirely offline. No data leaves your server.

Does it support VIES live validation?

Not in the free version. Pro version coming soon.

Can I add support for another form plugin?

Yes. Extend Vatigo_Integration_Base and register your class via the vatigo_register_integrations action hook. See the Settings page for a code example.

Is this GDPR compliant?

Yes. No personal data is stored or transmitted. VAT IDs are validated in memory and discarded.

Can I customise the error messages?

Yes. Go to Settings EU VAT Validator and enter a custom error message. Leave empty to use the default per-country messages.

The inline feedback looks different from my theme – can I style it?

Yes. The feedback element uses the class .vatigo-feedback. You can hide or restyle it via your theme’s CSS.

1.0.0

  • Initial release
  • Contact Form 7 integration with SWV required validation support (CF7 5.6+)
  • WPForms integration with real-time inline feedback
  • Fluent Forms integration
  • Pattern validation for all 27 EU member states
  • Admin settings page with integration toggle and hook reference
  • Custom error message override
  • Extensible integration API
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