A Billing Specialist is a professional who is responsible for managing all activities and staff in the billing function while they oversee the development of policies and procedures that ensure timely, accurate customer invoicing. Their duties are to Reconcile billing accounts to the general ledger.
https://www.hrishiblogbuddhi.com/kra-and-kpi/accounting-sector-kra-and-kpi/billing-specialist-job-description-duties-kra-kpi-and-more/