Originally Posted by
bpgveg14
If they take Amex but have a minimum charge (not allowed by Amex),
Actually it is allowed if they do not accept any credit cards that do not allow a minimum like Visa and Mastercard. Same thing with Discover. Both agreements allow them to set a minimum charge, but no higher then any other cards they accept
If all they accept is Amex, the merchant agreement lets them set whatever minimum they want.