You can confirm the void or refund by logging into your Virtual Terminal. You should have been provided login information by your gateway provider.
You can access your Virtual Terminal login page in Jackrabbit by going to the Gear (icon) > Settings > ePayments > Credit Cards/Bank Accounts Settings > Manage Settings (button). Click on the Virtual Terminal button. Learn more about eCommerce by going to ePayments in Jackrabbit (Credit Card & Bank Account Draft).