I am a bit confused about the paypal vault payment system what is the best way of validating the CVV, because in most cases if cvv is supplied during storing card in vault it returns the U(Service not available), X(No response) also no status. Not sure how to handle these kinds of situations, because even though it returns U or X status the payment authorization is successful. So should we consider a valid authorization only if returned cvv status is M(Match) when providing cvv is mandatory and for other status should we stop and prompt users to try again by changing the card details? I will be thankful if anybody can help.
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