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According to MerchantCouncil.org, each credit card company has its own rules for contractors charging convenience fees to its clients, including the government. MasterCard does allow contractors that provide support services to the government to charge the fee. The charge is not allowed for American Express cards. Discover cards may have the charge if other cards the merchant accepts are also charged the fee. Visa states that the fee must be disclosed and must be out of the normal form of payment for customers.
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