A decoding system has a decoding engine running on a mobile device. The decoding engine decodes signals produced from a read of a first party's financial transaction card. The decoding engine accepts and initializes incoming signals from a read of the first party's financial transaction card. A transaction engine runs on the mobile device and is coupled to the decoding engine. The transaction engine receives as its input decoded first party's financial transaction card information from the decoding engine. A user interaction engine is configured to utilize a touch screen of the mobile device. A first party or second party can input at least one of numbers, characters, and signatures by touching the touch screen.