> You can ONLY purchase this ticket as a subscription model. If you’re a tourist, you must cancel before the 10th of the month or you get auto rebilled.
Pro tip: some websites offer to start the subscription later in the month and you only pay for those days. So if, for example, you were to attend a certain hacker conference in Hamburg at the end of December, you could buy the ticket for the last 5 days of the month for 49/31*5 euro. Just have to cancel before 10th of December so that it doesn't renew. ("HVV Switch" App)
Pro tip: some websites offer to start the subscription later in the month and you only pay for those days. So if, for example, you were to attend a certain hacker conference in Hamburg at the end of December, you could buy the ticket for the last 5 days of the month for 49/31*5 euro. Just have to cancel before 10th of December so that it doesn't renew. ("HVV Switch" App)