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Issue #1595602 by benjy, rszrama: add CVV validation support for JCB and Diners Club credit cards, whose numbers start with a 3 but use 3-digit CVVs instead of the 4-digit CVV used by American Express.
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Issue #1595602 by benjy, rszrama: add CVV validation support for JCB and Diners Club credit cards, whose numbers start with a 3 but use 3-digit CVVs instead of the 4-digit CVV used by American Express.