Managed end-to-end OTC cycle with Accounts Receivable focusing on invoice processing, order validation, and billing accuracy; handled AR operations including invoice generation, billing corrections, payment application, and reconciliation of customer accounts; monitored and resolved order exceptions, pricing discrepancies, and authorization issues to ensure accurate invoicing and compliance; performed payment verification and aided in collections to reduce overdue balances and improve Days Sales Outstanding; coordinated with clients, insurance payers, and internal stakeholders to resolve billing disputes and payment-related queries; processed customer orders and maintained data in Oracle Order Management System (Oracle ERP), ensuring data integrity and timely order flow; supported month-end closing activities by AR reconciliation, reporting, and account balancing.