For urban buses, 1 TAP is all it takes: just hold your contactless bank card to the ticket validation machine when boarding.
For suburban buses, extraurban speed lines and mixed-fare lines (see the list here) 2 TAPS are required: one getting on and one getting off the bus, to be charged the correct fare. Attention: failure to tap when getting off the bus will result in the full fare being charged for the entire route, as the correct fare cannot be calculated.
Attention: if you forget to tap system will not be able to calculate the correct fare and you will be debitted the entire amount from where you are getting on the bus until terminus of arrival.
Operational Instructions:
Hold your card or device near the contactless ticket validation machine's sensor. Wait for the “green” light signalling a successful tap, and listen to the confirmation beep. The system does not provide paper receipts.
Please remember that if the ticket validation machine displays a “red” light, followed by an on-screen error message, the card has not been validated by the system, and the passenger does not have a valid ticket.
Actual charges for the service will appear a few days after use.