Presto places a $29 temporary authorization hold on your card to verify funds before starting a charging session. The hold is valid until you charge successfully or 6 hours when it is automatically released.
If your session costs less than $29 the remainder of the hold is returned to your account.
If the session costs more than $29, you will be billed for that higher amount. It may temporarily appear like you are charged twice, until the transaction is settled.
Here is an example of how it may appear on your bank statement:
Please note that reversal times are dependent on the type of card and policies of your bank.