EFTPOS refund credit card

This transaction is a combination of an Authorisation, which requests approval for a Purchase to proceed and a Purchase completion, which provides notification that the authorised purchase has completed. By utilising this combination of transactions, the merchant is provided with the ability to add a tip to a credit card transaction after having presented the cardholder with the transaction record.

The terminal is to allow the merchant to add and or modify the tip amount or the total transaction amount, while prohibiting the modification of any other transactional data. The terminal is to limit the total amount of the purchase completion to a maximum of 150% of the value of the accepted authorisation i.e. the tip amount cannot exceed 50% of the authorised amount.