YITH WooCommerce Point of Sale allows you to turn your WooCommerce installation into an easy-to-use and powerful cash register for each type of store or business..
The combined use with YITH PDF Invoices allows showing the fields (VAT and SSN and fields related to the Italian Electronic Invoicing) added by the PDF Invoices plugin.
When creating a new customer profile or editing an existing one, YITH PDF Invoices fields will show in the form.
Additional fields will show when using Electronic Invoicing for Italian customers.
For further details about YITH Point of Sale settings, please refer to the official documentation.