can credit cards assess a convenience fee
281.228.6100 or toll free 1-866-252-NACM (6226). Convenience Fee Assessment Guidelines for Merchants (Credit Cards). A merchant that charges a convenience fee must ensure that the fee is: Charged for a bona fide convenience in the form of an alternative payment channel outside the merchant s customary payment channels. (Example: A face-to-face merchant allows customers the convenience of paying by phone or Internet.).