Transaction Commands may cause a transfer of funds
| Authorisation (also known as "Preauthorisation) | Causes a reservation of funds on the cardholders account |
| Authorisation Reversal | Unreserve the funds previously reserved on the cardholders account |
| Debit (also known as "Sale" or "Purchase") | Causes a transfer of funds from the cardholder to the merchant |
| Credit (also known as "Refund" or "Pay") | Causes a transfer of funds from the merchant to the cardholder |
| Void | Cancel one of the above commands within a short time after the command was initiated |