A payment module includes: one or more processors, memory, a first interface module configured to couple the payment module with a control unit of an offline-payment operated machine, and a short-range communication capability for communicating with one or more mobile devices each including a complimentary short-range communication capability and a long-range communication capability. The payment module receives a transaction request via the short-range communication capability from a mobile device to perform a transaction with the offline-payment operated machine. The payment module validates the transaction request to verify that the mobile device is authorized to initiate payment for the transaction by a remote server via the long-range communication capability. In accordance with a determination that the transaction request is valid, the payment module causes the offline-payment operated machine to perform the requested transaction by issuing a signal, via the first interface module, to the control unit to perform the transaction.