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    Mastercard Pay As You Go Workflow
    The Mastercard Pay As You Go (PAYG) workflow begins when the rider taps a payment card at the fare collection terminal. 
             
 
        
Figure:
Pay As You Go Model
- The cardholder taps the card to enter the transit system.
 - The gate validates the card using Mastercard combined data authentication (CDA), card expiration date, and the deny list.
 - When the card is valid, the gate allows the passenger to enter the transit system.
 - When the CDA fails, the card is added to the deny list, and the debt recovery process begins. See Debt Recovery Workflows.
 - You send an authorization request for a nominal amount. See Mastercard Authorization with EMV Data.
 - When the authorization is successful, you calculate the fare for the travel period and submit a sale request at the end of the travel period.