The card must be scanned ("checked in") at a card reader, either at a train platform or on board a bus, at the start and the end of each journey, and the system automatically calculates the price of the journey; failure to check in results in a fine. The money is deducted from a prepaid account; alternatively, a card can be signed up for a payment scheme so that the money is automatically deducted from the holder's bank account. The more trips a passenger makes per month, the less money each trip will cost. The old discount system worked that way, too; however, the system was limited to a set number of zones, while the new discount system applies nationwide.