At the W:O:A 2018 it will again be possible to buy drinks, food and other items with our cashless payment system. Almost all stalls on the site are involved, only a few stalls on the campsite and the stalls and shops in the village are not part of the system. News on www.wacken.com
No, I just took the wrong link. It's http://cashless.wacken.com - the page afterwards has a proper SSL certificate of course.