
For merchants who offer an alternate payment channel for customers to pay for goods or services, a convenience fee may be added to the transaction amount. If the merchant chooses to assess a convenience fee to its customers, the merchant must adhere to the following rules:
Example:
The merchant provides utility services to its customers, and the customary way to pay is by mail or in person at the merchant’s location. For the convenience of its customers, the merchant also offers a website for payments. In this example the merchant may apply a convenience fee to payments made via the website.
A merchant must not directly or indirectly require any MasterCard cardholder to pay a surcharge or any part of any merchant discount or any contemporaneous finance charge in connection with a MasterCard card 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.
Also:
A merchant must not require or post signs indicating that it requires a minimum or maximum transaction amount to accept a valid MasterCard card.