Matias Llanos
Generally speaking, e-tickets are ‘validated’ with their purchase. Note that ZVV tickets are regional fare network tickets, which might be comparable to subway tickets in your country. There is absolutely no point buying such tickets in advance, especially after a flight, because a 4 zone ZVV single journey ticket is valid only 2 hours. A ‘return’ ZVV ticket costing twice as much is valid 24h.
Each ticket shows zones and validity times as displayed. During the ticket’s validity, you can travel unlimited times within the listed zones on all modes of transport.