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Re: credit card conventional wisdom (fwd)
The AMEX digits aren't part of the standard info- someone I spoke to
who started off as a grey box programmer said that he thought they were
just process control.
Card-present/Card-not-present can be determined from info on the
magnetic stripe; for visa cards, this info is stored in a three-digit
checksum at the end of the discretionary info.
Card Imprints taken with no online authorisation are typically charged a
transaction fee of 3-6%: with authorisation, 1.5-3%. ATM card
transactions are charged at around $0.10 per transaction.