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Ah yes, "anonymous"
(sopuli.xyz)
This is a community for designs specifically crafted to make the experience worse for the user. This can be due to greed, apathy, laziness or just downright scumbaggery.
They probably need some kind of token of authentication, bit In not sure what other methods they could use that would be better.
A random number that is displayed only once and it's the buyers responsibility to record it.
Additionally, generate a downloadable pdf or similar with qr code containing whatever info needed to verify the ticket.