The Tax Invoice MUST be requested upon purchase of the product, it is no longer possible to request an invoice after the goods have been shipped. All online sales are attributable to mail order sales and therefore without invoicing obligation as required by article 22 of the Presidential Decree n. 633 of 1972, and without the obligation to issue a receipt as required by article 2 of the Presidential Decree of 21 December 1996, n. 696 but only annotated in the compensation register