We are going to need a access to Budapest's transport for about 4 days. The difference in price between the 72 hours (4150ft) and the 7 days card (4950ft) is trivial - so its worth it to buy the 7 days one for 4 days in Budapest. You need to provide details of your ID for the 7 day card though.
From the rules I think I can use my New Zealand driver's licence as ID - it has a picture. My question is - how do I buy a card and link it to a foreign ID - can I do this with the automated vending machines or do I need to find a staffed office?