Frequently Asked Questions

General Questions

Does the module work with WooCommerce block checkout?

Yes, the module fully supports block checkout. All key features work:

Company ID, Tax ID, VAT ID fields
“I’m buying as a company” checkbox
VIES Tax ID validation
ARES validation and autofill
VAT exemption (Reverse Charge, Export)

Some visual settings (e.g., half-width fields, moving to form beginning) are only available for classic checkout, as block checkout has its own layout system. However, module functionality is fully preserved.

Can I use the module for a Slovak e-shop?

Yes. The module supports Slovak specifics - it distinguishes between Tax ID (DIČ) and VAT ID (IČ DPH) using the billing_dic_dph field. For Slovak customers, VAT ID is automatically used for VIES validation and Reverse Charge.

Which countries are supported?

The module supports all EU countries for:

VIES Tax ID validation
EU Reverse Charge

ARES (automatic filling and Company ID validation) works only for Czech entities.

VAT Exemption

Why isn't zero VAT being applied?

Most common reasons:

Customer is from the same country as the shop - Reverse Charge only applies to other EU countries
Tax ID is not valid in VIES - Verify on VIES portal
Reverse Charge feature is not enabled - Enable in module settings
Tax ID is not filled - Customer must enter Tax ID

Detailed diagnostics can be found in the Troubleshooting section.

How do I verify that Tax ID passed validation?

In admin - WPify Woo → WPify Logs - select the appropriate log and date
On order - VAT exemption status is displayed in order detail
Meta data - Check is_vat_exempt and _wpify_vat_exempt_reason on the order

How is destination country for VAT determined?

Depends on WooCommerce settings (Settings → Taxes → Calculate taxes based on):

Setting	Country Used	Typical Use
Billing address	Customer billing country	Services (B2B)
Shipping address	Shipping country	Physical goods

Can I exempt customers outside EU from VAT?

Yes, enable the “Enable third country export” feature. Exemption is automatically applied for all countries outside EU (B2B and B2C).

Invoice Integration

How to display "Reverse Charge" note on invoice?

The module does not display notes on invoices by itself. This must be handled by your invoicing plugin based on meta data:

is_vat_exempt = yes - order is exempt
_wpify_vat_exempt_reason = reverse_charge - reason is Reverse Charge

Integration examples can be found in the For Developers section.

Does it work with WPify Woo Fakturoid?

Yes, the WPify Woo Fakturoid plugin automatically processes VAT exemption information based on meta data from this module.

Does it work with WooCommerce PDF Invoices?

You need to add custom code to display the note. Example can be found in the developer documentation.

Validation

What if VIES service doesn't work?

VIES may have occasional outages. You have options:

Allow orders without validation - Enable “Submit order even if VIES verification fails”. The order goes through, but VAT is not deducted.

You can check VIES service status on the official portal.

Can I use custom Tax ID validation?

Yes, use the wpify_woo_icdic_vat_id_valid_for_exempt filter. Example can be found in the developer documentation.

Why is Company ID marked as invalid?

Possible reasons:

Wrong format - Company ID must be 8 digits without spaces
New company - May take several days to appear in ARES
Foreign company - ARES contains only Czech entities
ARES outage - Check logs in WPify Woo → WPify Logs

Field Settings

How to hide fields for private customers?

Enable “Show ‘I’m buying as a company’ checkbox”. Company ID, Tax ID and VAT ID fields will only be displayed after checking this checkbox.

Can I add Company ID/Tax ID fields to shipping address?

The module currently adds fields only to billing address. For shipping address, custom modification using filters would be needed - see developer documentation.

How to change field labels?

Use standard WordPress localization or filter:

add_filter( 'woocommerce_checkout_fields', function( $fields ) {
    $fields['billing']['billing_ic']['label'] = 'My Company ID';
    return $fields;
}, 20 );