moloni

With this plugin you can add VAT and VIES support to your WooCommerce store. The VAT field will be saved as ‘_billing_vat’.
Important: this plugin requires WooCommerce 3.0.0 or higher. 
Warning: to enable and use VIES information you need to have SOAP extension enabled (SoapClient PHP class).
<h3>Features</h3>
<ul>
<li>Adds VAT field to billing form.</li>
<li>Adds VAT field to outgoing email.</li>
<li>Adds VAT field to checkout billing information.</li>
<li>Adds VAT field to admin orders page.</li>
<li>Change VAT field label and description.</li>
<li>Validate Portuguese VAT numbers.</li>
<li>Choose how to handle vat field validation errors.</li>
<li>You can make VAT field required.</li>
<li>You can add VIES information to admin order page, checkout and user billing page.</li>
<li>Adds settings page under WooCommerce menu so you manage all the features.</li>
</ul>
<h3>Translations</h3>
<ul>
<li>English.</li>
<li>Portuguese.</li>
</ul>

Contribuinte Checkout

With this plugin you can add VAT and VIES support to your WooCommerce store. The VAT field will be saved as '_billing_vat'.

RVNSKI

What it does 
– Generates a Proforma Invoice (ISF) for unpaid orders (e.g., BACS). 
– Generates a VAT Invoice for paid orders. 
– LT company details (seller/bank), numbering series, prefixes/suffixes, “Start from” / “Next number”. 
– PDF attachments in emails: ISF (on-hold), VAT (processing/completed). 
– Unique protected download URLs (token + TTL) or “logged-in only”. 
– Templates can be overridden in your theme: <code>/yourtheme/lt-invoices-for-woocommerce/*</code>.
Notes 
– The VAT summary automatically follows WooCommerce tax settings. 
– PDF generation is handled by Dompdf (bundled). 
– Variables for showing client ID/VAT: billing_company_code, billing_company_id, company_id, billing_company_vat, company_vat, billing_vat_number, billing_vat

LT Invoices for WooCommerce

PDF invoices for Lithuania: Proforma and VAT invoices for WooCommerce orders.

Contribuinte Checkout vs LT Invoices for WooCommerce