1KASSA - One Cashier - Application for trading out of the office when paying in cash (taxi, courier services for the delivery of goods, provision of services outside the office), there is no need to issue a cash register to each employee, it is enough to use 1 remote cash desk, and through a mobile application on the courier's smartphone / employee, generate a check at a remote checkout, and provide its electronic version to the client (show a QR code or send by SMS or e-mail), this solution allows you to save money and not violate 54-FZ.