PRINCETON, N.J.--(BUSINESS WIRE)--Heartland Payment Systems (NYSE:HPY), one of the nation’s largest payment processors, announced today that its Heartland Omni-Channel Commerce Engine (XCE) formed an integral part of the Taco Bell® mobile ordering and payment app. Key Highlights/Facts The Heartland XCE connects the Taco Bell mobile app to the Heartland IRIS software and point-of-sale (POS) system. The Heartland Master Data Management solution also provides the Heartland XCE and mobile applicati