>If they are just showing up, I would not accept a credit card payment
>for $5. Whatever minimum you want to set would encourage cash or for
>students to put their charges together. 

Visa's and MasterCard's regulations prohibit minimum charge amounts.
American Express's regulations do not explicitly prohibit minimum charges,
but its policy is to discourage any merchant practices that create a
"barrier to acceptance." Amex does prohibit "discrimination" against the
Amex card, however, so if a merchant has no minimum charge for Visa and
MasterCard, the merchant may not discriminate against Amex by imposing a
minimum charge.

Becky Fitzgerald
Susquehanna Museum

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