The invention relates to a brake force transmission device for a brake force amplifier with an elastic reaction element, an input body, with an associated working surface, an output body, with an associated working surface, with a first transfer ratio, defined by a working surface ratio, actively dependent on the reaction element. The stretched film of void-containing thermoplastic resin has no charge therein and can be processed secondarily with lesser electrostatic disturbance even in a low-humidity environment. The antenna body includes an annular metal sheet. The adjoining electronic components are connected through the first or the second connection terminal. The consumer is authenticated over the communications network in accordance with the authenticated payment program if authentication is determined to be appropriate based on the authentication criteria defined by the merchant.