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If you've bought plane tickets online (for example), you might have noticed that you're charged an extra few percent if you pay by credit card compared to debit card.
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Any business charging extra to customers who pay with a credit card is breaking visa and mastercard merchant guidelines and should be reported (
http://www.mastercard.com/us/persona...iolations.html or 1-800-VISA-911).
They can offer a discount for paying by cash but they cannot flat out charge extra for using credit.