You buy tickets on the bus, you can pay with creditcard, cash or with Vipps.
NOTE! On return from Gardermoen, it may happen that the bus runs the new road from Olimb. If there are locals who want to get on the bus on the Olimb-Jevnaker-Aasbygda-Klækken route, they must call the driver of the bus directly and let him know in advance. 99214973/99214974.