WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. We work with the world's most valuable brands and have global reach across 100+ markets, with deep local expertise. Our people are the key to our success. We're committed to fostering a culture of creativity, belonging and continuous learning, attracting and developing the brightest talent, and providing exciting career opportunities that help our people grow. For more information, visit WPP.com. What you'll be doing: Team Supervision & Leadership Lead, mentor, and evaluate a team of OTC Billing Specialists. Set daily, weekly, and monthly performance targets (KPIs) for the billing team and monitor progress. Standardize training materials and ensure the team is cross-trained on various OTC workflows and customer portfolios. Order-to-Cash Billing Operations Oversee the end-to-end billing workflow, ensuring sales orders, contracts, and shipping/delivery data are accurately converted into customer invoices. Review and approve high-value invoices, credit/debit memos, manual adjustments, and cancellations. Ensure tight integration and communication between the billing team, Order Management (Customer Service), Credit/Collections, and Cash Application. Manage customer-specific billing requirements Dispute Management & Customer Relations Serve as the escalation point for complex billing disputes, price discrepancies, and tax issues. Work closely with the Collections to resolve root causes of billing-related payment delays, minimizing Days Sales Outstanding (DSO). Ensure timely resolution of cu