Forty-four percent of the 15 billion bills in the U.S. are paid with cash or check - archaic methods in a mobile world. Mastercard is buying Transactis as it readies its Bill Pay Exchange for a 2019 launch. Mastercard's Transactis deal is one that deepens and broadens the payment giant's online bill payments, as Mastercard's EVP of New Payments Colleen Taylor explains.