17 Dec
2003
17 Dec
'03
11:17 p.m.
Further info: 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. Simon