The future-state payroll model must support a highly complex workforce that includes faculty, clinical staff, residents, hourly employees, multiple concurrent appointments, differentials, and shift and on-call rules while delivering accurate, compliant, timely, and auditable payroll at scale. Lead integration strategy between UKG and Workday, including payroll data flows, interface specifications, API or connector configuration, data mapping, end-to-end testing, error handling, and reconciliation across earnings, deductions, taxes, and general ledger outputs.