Contact-Proximity-Interface: Proximity Communication Interface
| Source Element | Destination Element | Flow |
|---|---|---|
| BUS Transit Vehicle | BUS Traveler Electronic Fare Cards | request for payment |
| BUS Traveler Electronic Fare Cards | BUS Transit Vehicle | payment |
| Lextran Transit Vehicle | Lextran Traveler Electronic Fare Cards | payment device update |
| Lextran Traveler Electronic Fare Cards | request for payment | |
| Lextran Traveler Electronic Fare Cards | Lextran Transit Vehicle | payment |
| Lextran Transit Vehicle | payment device information |