Secure electronic payment is disclosed as it may be implemented for a point of sale machine such as but not limited to, vending machines/devices, parking devices/facilities, and laundry machines/facilities. An example secure electronic payment system includes a remote payment processor to confirm payment for a transaction at a point of sale device and issue a token to a mobile device for completing the transaction. A wireless interface module at the point of sale device is configured to receive the token from the mobile device for the transaction via a wireless communications protocol. A token processing module at the point of sale device confirms validity of the token. A transaction processing module negotiates the transaction at the point of sale device by actuating the point of sale device.