Up-Front Validation

Up-Front Validation method means that each contactless card tap originates a card-present payment transaction. The card issuer approval/decline response comes in several seconds. The validatorValidator is a device with contactless card reader, registering card taps and validating access to the transit services. It is not a point of sale in UniTiAg model. More cannot wait for the card issuer response and lets the patron ride. If the ticketing system gets the issuer decline it places the card in the stop list.