In addition to the processing fees charged by AffiniPay to merchants who use WildApricot Payments, AffiniPay is required to pass on any additional transaction fees charged by credit card companies such as American Express, VISA, MasterCard, and Discover. These additional credit card fees are not charged by WildApricot or AffiniPay.Specific transaction fees differ by credit card and are detailed on AffiniPay's Fees page.