Portico supports the option to indicate whether the amount requested in a credit transaction is Estimated or Final. This indicator is passed through to the host and the appropriate card brands for merchants processing on all authorization platforms. It is expected that CreditAuth or RecurringBillingAuth is used when the amount is estimated (for example, where a tip may be added afterwards or an hourly rental is not returned on time), and that CreditSale or RecurringBilling is used when the final amount is known at the time of the request.

To indicate whether the transaction amount is estimated or final, send the AmountIndicator field.