Audit customer billing and carrier or vendor invoices, and validate carrier and vendor settlements, against agreed rates, accessorials, service and shipment details, and supporting documentation, including bills of lading, proof of delivery, customs paperwork, and related record; investigate and resolve discrepancies. Collaborate with Accounting, Operations, IT and other departments to resolve issues, improve workflows, strengthen controls, and support departmental projects; communicate with internal teams and as needed, customers, carriers, and vendors regarding invoices, payments, discrepancies, documentation, and system setup.