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But why does Amex does it differently with their 4 digit CVV? Goolge search doesn't reveal any good answer. Thats a big confusion. Anyway cards could have put C
by tmd83 9y ago
But why does Amex does it differently with their 4 digit CVV? Goolge search doesn't reveal any good answer. Thats a big confusion. Anyway cards could have put CVV beside the number if they wanted. In that case I think people would have found them.
- notpeter 9y agoConfusingly Amex has both a 4 digit CID (Front) and 3 digit CSC (Back). The latter I think is only ever used internally by Amex, not for transaction processing.
- tixocloud 9y agoDifferent systems which use different fraud algorithms proposed by different people from the other credit card issuers.