My customer that is using Chase payment gateway v7 no longer have the ability to validate the CVV code directly in the hosted payment page. The validations of the CVV code is now sent to Chase. Chase can validate this but does not prevent the bank from blocking an invalid 4 digit card for Master or Visa card.
Because Chase is only a middle man they cannot block the transaction. It's up to the bank to decide. An invalid credit card can still be approved for some banks for this case causing a fraud issue.
Adding a validation simple validation based on the card type e.g. Visa, Master card is 3 digit or AMEX is 4 digit in the hosted payment page can prevent this easily before it goes to Chase.
Ho Ming Wu
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