How does the cashless system work, how and how much can you top up on your chip, how do I check my balance, and how do I request a refund? You'll find it all in the article here: https://obsceneextreme.cz/en/cashless.

❗Click on the link above, enter your ticket number and the amount you want to charge. You can recharge from anywhere in the world and only by online card, Apple Pay and Google Pay. If charging doesn't work, recharge on site. Pre-charge credit only works for the first charge before entering the premises. It will not work for recharging during OEF as this is technically not possible.