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Amex is a closed loop transaction system -- all the funding, financing, approvals,etc are done through one central system, therefore they can make their own rules regarding payment and charge allowances. And they are notoriously bad at fraud control imo -- Sleazy is totally right, they don't on most all their programs give you a fixed amount of charging limit, they simply use their whacked out formula to decline or approve.
I've seen people with Platinum cards get declined for 250 dollar purchases if it was outside their spending parameters they've mapped.
Damn those granola bars Sleazy ;)
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