 Payments company Bottomline Technologies Inc. EPAY, -2.86 said Friday it has reached an agreement to be acquired by private-equity firm Thoma Bravo in an all-cash deal valued at about 2.6 billion. Under the terms of the deal, Bottomline shareholders will receive 57 a share, equal to a premium of 42 over the stocks closing price Oct. 19, the day before the board announced a strategic review. 