The presentation of a contactless payment card to a ticket inspector, which had previously been used for the purchase of a ticket in the ticket validator, is completely safe. The controller does not have access to payment card data. The payment card is only the transaction identifier. The ticket is saved in the central system. The card data is automatically encrypted when the card is tapped over a ticket validator and in a secure form (token) is stored in the central system. The inspector receives from the central system only information regarding the ticket assigned to the payment card.