ARRIVAL: approach the cash desk at the Avia service station with the Parclick voucher. Follow the instructions they give you.
If there is no-one there, ring the intercom.
TO OPEN THE BARRIER: use the access code the staff from the Avia service station gave you. Park in any free space (level -1).
DEPARTURE / IF YOUR BOOKING ALLOWS UNLIMITED ENTRANCE AND EXIT: use the access code the staff gave you.
Boulevard de la Chapelle 7