Charges on my card after failed transaction?

is a system used to verify the address of a person claiming to own a credit card. The system will check the billing address of the credit card provided by the user with the address on file at the credit card company. The other security features for the credit card include the CVV2 number.

AVS is used when the merchant verifies credit card data, such as billing address and zip code, against the Visa/MasterCard billing information of the cardholder. AVS verifies that the billing address of the credit or debit card matches the address that was given by the customer. Because AVS only verifies the numeric portion of the address, certain anomalies like apartment numbers can cause false declines; however, it is reported to be a rare occurrence.

"Declined due to AVS mismatch", the authorization code, along with the hold on the authorized funds, will remain on the customer's card until the card issuing bank removes the authorization. As a result, the held funds may be subtracted from the customer's available balance, and an online statement may reflect the authorization request which might be mistaken for an actual charge. Most card issuing banks will remove authorizations within 3–7 days if they are not claimed for settlement.