Abstract: The invention provides a system, comprising a camera, configured to detect a user in the field of view of the camera and to track the detected user, a display, an interaction module, configured to interact with the user, and a processor, wherein, in operation, the processor is configured to detect a user in the field of view of the camera, cause the display to display a first image, said image including at least one tracking portion, move the at least one tracking portion based on the movement of the user detected by the camera, upon interaction of the user with the interaction module, display a second image. A method for interacting with a user and a computer program product implementing said method on a programmable device is also disclosed, wherein the interaction module comprises a payment module, and the interaction of the user comprises a payment through the payment module.