There are several User Permissions that control the ability to void or refund credit cards. These permissions are defaulted to No (unchecked) for new User IDs.
Go to Tools > Manage Users & Permissions > User IDs (click on a UserID) > User Permissions (left) to set the permissions.
Note: After changing the permissions, you'll need to logout and log back in for the permissions to take effect.
These are the permissions related to Refund or Void an ePayment:
|Families||Void on Card|
|Refund on Card|
See Permissions for Jackrabbit Users for more information.