Several times a week when I run SuperManager I will get a pre-authorization required message on one or more orders. When I look at the orders there is a one cent difference between the authorized amount and the order total. When I reduce the shipping charges by one cent to balance the totals, I am able to charge the order.
Losing a penny once in awhile is not an issue. Having to take the extra time to review and fix this is an issue.
Which type of shopping cart are the orders coming from?