A Merchant must not directly or indirectly require any Cardholder to pay a surcharge or any part of any Merchant discount or any contemporaneous finance charge in connection with a Transaction. A Merchant may provide a discount to its customers for cash payments. A Merchant is permitted to charge a fee (such as a bona fide commission, postage, expedited service or convenience fees, and the like) if the fee is imposed on all like transactions regardless of the form of payment used, or as the Corporation has expressly permitted in writing.
For purposes of this Rule:
1. A surcharge is any fee charged in connection with a Transaction that is not charged if another payment method is used.
2. The Merchant discount fee is any fee a Merchant pays to an Acquirer so that the Acquirer will acquire the Transactions of the Merchant.
Ref: https://www.mastercard.us/en-us/about-mastercard/what-we-do/rules.html
Posted 2019-05-04