EU business tax exemption base on VAT validation (VIES)

Just leaving a reply here because we’re also looking for a solution in this matter. The proposed solution is not really a good one as the customers VAT number can only be added in retrospect and not during checkout. About 10% of our sales is to companies (B2B) in the EU which should be given a 0% VAT rate. For example a company ordering on Allcam.it (our website for Italy) should have 0% VAT rate calculated upon entering a valid VAT number. We use Sufio for our invoices which has an option to have a VAT field in the cart with VIES check. But right now when product is €99,99 including VAT, the price is just changed to €99,99 excluding VAT, very strange.