Through my bank, I get a few Koru passes, when I've spend a certain amount of money on the credit card.
If I book a flight, it will automatically work out that I can use one of my complimentary Koru passes, as it associates it with my Air NZ flight.
My question is: If I invite a friend, how does it work? Do I just give them my voucher number at the Koru Club reception? Do they need to see my friends boarding pass (proving that he's flying with Air NZ)?