Perhaps I'm hyper-ventilating over nothing... but I've got less than a week to go before flying into Lima. I pre-booked domestic flight, round-trip from Lima to Cuzco. The credit card that I used to book the flight has just been cancelled, and I shredded the card. But then I read the fine print of Star Peru e-ticket and lo' and behold credit card is required pre-boarding?! So er... just wondering, does anyone know if that is an absolute must or I could get by with a simple explanation....