An off topic, but related question: A friend just bought a refillable, reusable card (for the MRT only). It has a Visa logo on the front, a 16 digit Visa-like number on the back, and a CVV. But it is not linked to his bank account, so is not a debit card. And he was asked no questions about his employment or salary, so it is not a credit card either. Does anyone know what exactly this card is ?