Invalidate the tickets without notifying the customer. That way they travel and everything only to be turned away at the venue.
231 karma · joined September 24, 2023
1: https://chodounsky.com/2019/03/24/progressive-web-applicatio...
As you have guessed, this used a rendering feature that was not pure.
The author of the site was naughty and didn't do any sanitization :) They said they've fixed it in another comment, though.