This paper describes a newly designed smart ticket payment system for the company ZET (Zagreb Electric Tram) from Zagreb with the possibility of adapting the designed system of this type and purpose for other public transport service providers. The paper presents the conceptual design of a self - service kiosk with elements of possible improvements and additional opportunities for the purpose of better positioning in the market. The purpose of the device is to enable the sale of tickets at direct charge, eliminating the cost of human resources and commissions on sales through intermediaries. The introductory chapter explains the purpose and reason for the introduction of a smart billing system, and presents the current solution with all the shortcomings that the designed improved billing system does not have. In the practical part of the paper, the conceptual solution in space will be presented, as well as the application of the system by the user with the elaborated principle of operation of the device.