After choosing the shipping address, proceeding with checkout, during the payment phase, in the "Additional information" section you can enter "tax code or VAT number" and "PEC or Unique Code" The invoice will be sent within 14 days from the date of the order inside the tax drawer and in PDF format by email. If you have not entered the SDI code and the pec, the invoice will be sent directly to the Revenue Agency and you will have to download it yourself or through your accountant.