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Address Verification System (AVS) - AVS compares the numeric part of the customer’s billing address and zip code or postal code to the information on file with the credit card issuer.Card Verification Value (CVV) - The CVV is a 3-digit or 4-digit number on the customer’s credit card. Credit card companies prohibit the storage of the CVV code, so asking for the CVV is a way of ensuring that a customer has the card physically in their possession. Credit card information stolen from a merchant database is also less useable, because it shouldn't contain CVV information.
In the Shopify Payments section, click Manage.In the Fraud prevention section, select both options for AVS and CVV to automatically decline charges.Click Save
Shopify Settings
Shopify has two fraud filters that you can choose to enable, AVS and CVV:
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