TrustCommerce is the mid-range payment processing system. Unlike Authorize.net which only allows you to work with one merchant account or ChasePaymentech which has higher fees but every feature imaginable, TrustCommerce is in the mid-range. They have reasonable fees, offer flexibility in their gateway, and aren't overloaded with things you won't need nor lack essentials for merchants who aren't the absolute basic type. TrustCommerce is well integrated with several e-commerce systems, offers good support, and has been serving mid-range clients for many, many years.