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    Mastercard Pay As You Go
    These are the key characteristics of the Mastercard Pay As You Go (PAYG) transaction
            model:
- Journeys are multimodal.
 - Fares are based on distance.
 - Points of entry are contactless.
 - Accounts are verified with an authorization for a nominal amount or the maximum fare amount.
 - The deny list is checked so that cardholders with previously declined transactions can be blocked.
 - Data can be authenticated offline to confirm that the card is valid.
 - Token Management Service(TMS) option for managing sensitive authentication data (SAD).
 - Multiple card taps and fares can be aggregated into a single payment.
 - The deny list is automatically updated every 20 minutes.
 - The back office records all trips and fares in order to reconstruct journeys and calculate the final fare.
 - When the nominal amount authorization is declined, debt recovery can be performed.
 - Standard follow-on payment services can be used to capture, reverse, or void transactions.
 
Figure:
Mastercard Pay As You Go Model