Abstract: A method for generating a transaction signal using a first device and a second device includes generating first information dependent on a user-selected amount, transmitting the first information to a verification device and generating therefrom a signal, generating based on the first information with the verification device first verification information, transmitting the signal from the verification device to the first device where the signal is converted into a two-dimensional representation for display on the first device, recording the two-dimensional representation on the display of the first device with a camera of a second device and generating a recording signal, transmitting with the second device the recording signal, or other information dependent on the recording signal, to the verification device for generating second verification information, and generating the transaction signal when a comparison between the first verification information and the second verification information produces a pred