Comment by edwinwee

(Edwin from Stripe here.) Stripe CVV verification can be turned on with a click or two in the Dashboard (https://dashboard.stripe.com/radar/rules). (The card issuer automatically also does their own verfication, and they can choose to decline or approve based on their own logic.) But the effectiveness really depends on the type of business. We have it off by default because we found it improves payment acceptance rates for businesses by 0.08% on average—with no tangible effect on fraud. Basically, Stripe Radar ML fraud detection would catch the fraudster anyway. So we thought businesses could use the small bump in revenue.