- Log in to your authorize.net account.
- Under Transaction Search in the left-side navigation, click Unsettled Transactions.
- Click on the Trans ID number of the order you wish to void. A window will appear with the order's info.
- Click the Void button at the top of the window.
Note: A transaction must be voided by approximately 5 pm on the day the purchase was made, otherwise the transaction will 'settle' at whatever time your settlement is (often about 6 pm).
If a purchase is made after the time at which your Authorize.net usually settles, you have until approximately 5 pm the next day to void it.