DALLAS--(BUSINESS WIRE)--Onyx CenterSource, a global leader in B2B payments and business intelligence for the hospitality industry, today announced a significant expansion of its GroupPay platform across 700 Hyatt properties. Following the successful adoption of GroupPay at more than 125 of Hyatt's owned and managed hotels, the solution is now being implemented at an additional 580 franchised properties throughout the Americas. GroupPay transforms one of the most complex aspects of event manage. ...