Verification
This type of transaction is essentially a $0 transaction.
This is typically processed in a card-not-present scenario, where the User wants to verify the credit card but not actually process an amount at that time.
Often, this transaction method is used to “tokenize” the credit card for later use. A verification transaction enables checking the validity of the credit card number, expiry date, and card security.
However, since no amount is sent, what is not being verified is the cardholder’s available balance.