We often run across circumstances where we need to change an order that is placed online after the card is authorized. If this is for less than the authorization, it's pretty easy to handle. The problem occurs when this is for greater than the original sale.

After contacting the customer and up selling them a product, or advising them there is an additional fee to ship freight to a home address, the question is how to handle the order at that point. If we just adjust the sales order and attempt to bill it, we get an error code saying we're exceeding the authorization as one would expect. I hate to do an entire new sales order for the difference.  What's the proper procedure for something like this?