CheckFree was primarily a consolidator and BSP, allowing trusted intermediaries (the CSPs) to manage the customer interaction. CheckFree was largely invisible to consumers, as CheckFree focused on back-office operations. By September 2000, the company signed multi-year contracts with 210 of the top billers (e.g., AT&T). CheckFree marketed itself as an A to Z provider, combining the functions of consolidator, BSP and sometimes even CSP.