At a system level, Authorize.Net has several anti-fraud features available:

Address Verification System - AVS is a verification system that compares the billing address information (Street Address and Zip Code) provided by the customer online with the billing address on file at the credit card issuing bank.

CVV2 - is a three-digit security code appearing in reverse italic at the top of the signature panel on the back of the card. Implementation of this feature requires the user to enter the
CVV2 code when making a purchase, helping to confirm that the user is the authorized cardholder.

Referrer URL - This feature allows a Merchant to designate the URL(s) from which
Authorize.Net allows a transaction to take place. The URL must be listed as a "Valid
Referrer URL" in the "Manage URLs" portion under "Settings" in the Merchant Interface. Through regular communications such as email, Web site and Merchant Interface changes, Authorize.Net has also advised

Merchants on additional actions they can take to detect, prevent and manage fraud:
Actively use the Address Verification System (AVS) and the CVV2 features listed above

Change password regularly and use alphanumeric characters

Monitor transaction batches daily prior to settlement and look for suspicious transaction activity

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