POP: compliant EU invoicing

POP helps ecommerce businesses manage electronic invoicing in Italy and across European markets. Generate XML and PDF invoices from every order and send each document through the right channel for its market: SdI for Italy and San Marino, PEPPOL for Belgium and France, KSeF for Poland, and ZUGFeRD / Factur‑X hybrid documents for Germany.Generate XML and PDF from each order, validate VAT numbers via VIES, and manage checkout fields, numbering, and VAT treatments.