Integrations & Testing: Direct payroll-to-Finance/GL integrations, third-party vendor connections (ADP, banks, benefit providers), parallel payroll runs, CRP, UAT, and go-live stabilization. Legislative & Union Compliance: Manage Federal, State, and Local taxation, W-2/year-end processing, garnishments, and Collective Bargaining Agreements (CBAs) for union/non-union workforces.