Abstract: An electronic system (1) is described to perform a purchase transaction of goods or services. The system includes a mobile electronic device (2) configured to receive (t3) a second message (MSG2) carrying an authorization data field (AUT_D) dicating a valid or invalid authorization to use an electronic money for performing the purchase transaction, configured to store the content of the authorization data field into a non-volatile memory (160) inside the mobile electronic device and configured to transmit (t5; t7?) a third message (MSG3; MSG4?) carrying an electronic money identification data field (EM_ID) for indicating data identifying the electronic money used for performing the purchase transaction and carrying the authorization data field (AUT_D; AUT_D?).