 ALLENTOWN, Pa. and LAS VEGAS--BUSINESS WIRE--- FOUR--Shift4 Payments NYSE: FOUR, the leader in integrated payment processing solutions, announced that it has surpassed 1 billion in weekly end-to-end payment processing volume for the first time in the companys history. Shift4 CEO Jared Isaacman states, This is an exciting milestone for Shift4, especially as we celebrate the one-year anniversary of our IPO. Our first billion-dollar year was 2004, which we thought was a pretty big deal at the time. 