Tos is a system for sending VAT invoices in the B2B model. The main goal is to eliminate invoice printing. In practice Tos will work as follows – at the time of purchase of goods, after giving the buyer’s NIP number, the seller instead of printing invoices, will send it to customer’s account in the Tos. The buyer at any time will be able to accept it. Invoice can be sent to a company’s general account, but it can also be sent to a specific person in the company.
https://www.tosend.pl