An interface module for a gaming system, the interface module arranged to be placed in data communication with a card reader and a user database storing user records, the interface module arranged to: determine that a user data card comprising a non-compatible smart card has been entered into a card reader; obtain a user identifier from a magnetic stripe of the user data card; and process the user identifier to obtain data from a user record associated with the identifier to enable further processing in respect of the user data card.