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You can find the updated Miva 10 Reference Guide here
When a customer tries to buy something in your store with a credit card, the data is sent to your payment processor, such as Chase Paymentech, or Authorize.net. Your payment processor runs a series of checks to see if the credit card is valid, and then authorizes the card for use. See Types of Payment Modules for more information.
In 9.0005.3, Miva Merchant added several features to protect your store against credit card fraud. One of these feature is the Authorization Failures tab. In this tab you can:
When a customer visits your store, Miva Merchant can see their IP address. If the customer's credit card fails authorization, a bunch of data about the failure is collected, including the IP address they were using. If you add the customer's IP address to your Authorization Blacklist, all attempts to use a credit card from that IP address will be ignored.
> Order Processing > Authorization Failures Tab
> Payment > Authorization Blacklist Tab
> Payment > Settings Tab > Fraud Section
Enhanced Protection from Automated Attacks in 9.0005.3
As long as this IP address is on your blacklist, all attempts to use a credit card from this address will be ignored. When the expiration date is reached, the IP address is automatically removed from your blacklist. The customer at this IP address will be able to submit credit card authorization attempts in your store again.