Abstract: A self-checkout system may include a proximity device detecting or getting detected by a mobile device of a user of a mobile payment service in the proximity of a point-of-sale of a shop supporting the mobile payment service, the user of the mobile device being a customer, a cashier system automatically recognizing shopping items of the customer when approaching the cashier system, and generating shopping information, and a server device confirming payment of the recognized shopping items by the mobile payment service upon matching between a first transaction identifier, generated by the server device based on the shopping information received from the proximity device and the cashier system, and a second transaction identifier, delivered by the mobile device and received from the mobile device or the proximity device and the cashier system, and to supply a payment confirmation to the one of the proximity device and the cashier system.

Abstract: An apparatus for level measuring in a flexible tank with a level sensor for non-contact detection of the level of the liquid in the tank, which detects the surface of the liquid across a flexible wall of the tank, and means for holding the level sensor in a position above the flexible wall of the tank.

Abstract: A security element for the identification and authentication of objects is disclosed. The element is connected by a self-adhesive label to an object. It has features that effectively prevent non-destructive detachment of the security element from an object. The security element has an optical code for identification. Furthermore, it is provided with random production-governed features by means of which authentication is made possible: upon irradiation with electromagnetic radiation, a scattering region of the security element brings about a characteristic scattering signal. The method of using the security element is disclosed for the identification and authentication of objects and also for protection against forgeries, and a method for the identification and authentication of objects on the basis of the security element.