An authorization reversal occurs when a merchant cancels a transaction before it has been settled. This effectively voids the sale and prevents the transaction from going through. From a merchant’s perspective, an authorization reversal typically does the least amount of damage as no money has been transferred, which means no interchange fees. And, since the order was never shipped, there are no return hassles or fees to worry about.
For example, let’s say a customer orders a product from your online store. After the order is placed, you realize that the product is out of stock. Instead of letting the transaction go through and then issuing a refund, you can initiate an authorization reversal to cancel the transaction before it’s settled.