 ALLENTOWN, Pa.--BUSINESS WIRE--- FOUR--Shift4 Payments NYSE: FOUR, the leader in integrated payment processing solutions, today announced the addition of six new integration partners into the companys Marketplace. These integrations enable Shift4 customers to seamlessly add new features and capabilities directly into their point-of-sale POS system, enhancing the companys value proposition by delivering a central hub for all business management tools. As part of the companys end-to-end ecosyste 