| Source Element | Destination Element | Flow |
|---|
| Madison County Transit Vehicles | Metro Transit Payment Card | request for payment |
|---|
| Metro Transit Payment Card | Madison County Transit Vehicles | payment |
|---|
| Metro Transit Vehicle (bus) | payment |
| Metro Transit Vehicle (rail) | payment |
| St Charles Area Transit (SCAT) Vehicle | payment |
| Metro Transit Vehicle (bus) | Metro Transit Payment Card | request for payment |
|---|
| Metro Transit Vehicle (rail) | Metro Transit Payment Card | request for payment |
|---|
| St Charles Area Transit (SCAT) Vehicle | Metro Transit Payment Card | request for payment |
|---|