Load money on your card and then use it. This principle is well-known from Prepaid subscriptions for mobile phones:
Prepaid cards need energy in the form of money before they can be used. You can easily load money onto the card at more than 1'000 k kiosk, Press & Books or avec outlets throughout Switzerland. Reload the card up as often as you like - up to a maximum amount of CHF 2'500 a year.