Retry failed VoidAuth transactions
The March release improved the subscribe() SOAP API behavior to still send VoidAuth transactions when subscribe() fails. This greatly reduced the number of Authorization transactions that expire without being deposited or voided. However, the VoidAuth transactions occasionally fail.
When the Authorization expires for a Visa card, you get Misuse of Auth fees from Visa. MasterCard has similar MC Processing Integrity fees.
There are good descriptions of the fees here:
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