Short answer
The synonyms for a card verification tool are card validator, CVV check, CVV2 validation, CVC2 check, CID check, AVS check, BIN lookup, and 3-D Secure authentication. The names get mixed in vendor docs. Each one points to a different test on a different part of the card data.
longtail card validator for credit card information
What each term means
- Card validator: runs the Luhn algorithm on the 15 or 16 digits. It confirms the number passes a checksum. It does not confirm the account exists or holds funds.
- CVV check: compares the 3 digit code on the back of a Visa, Mastercard, or Discover card, or the 4 digit code on the front of an American Express card, against the issuer record. Visa prints CVV2 in its specs. Mastercard prints CVC2. American Express prints CID.
- AVS check: compares the billing street number and ZIP code to the issuer file. The response is one letter. Y means both match. A means street matches, ZIP does not. Z means ZIP matches, street does not.
- BIN lookup: reads the first 6 to 8 digits and returns the card brand, issuer bank, card type, and country of issue. It returns no account data.
- 3-D Secure: adds an authentication step at the issuer. The cardholder enters a password or a code sent to a phone. The merchant sees a pass or fail token.
What these tools do not do
A card validator does not touch the issuer network. A BIN lookup does not touch the issuer network. A CVV check and an AVS check do reach the issuer, and both return a code, not a balance. No verification tool in this list reports the available credit line or the current balance. That data sits in the issuer host system and stays there.
Why the names overlap
Processors sell the checks as one product. Stripe, Adyen, and Braintree group CVV and AVS in a single response object. That grouping is where the synonym problem starts. A merchant asks for a verification tool and gets four checks in one API call.
synonym card verification tool
Legal limits
CVV data is sensitive authentication data under PCI DSS. A merchant may not store it after authorization. The Fair Credit Billing Act and Regulation Z cap cardholder liability for unauthorized charges, and 18 U.S.C. 1029 covers use of card numbers a person does not own. Running any of these checks on cards you do not hold is a federal crime in the United States.