Evaluate vendor invoices, check requests, and expense reports for appropriateness, adequate support, and compliance with organizational policy, contract terms, and grant or funding restrictions; determine proper general ledger, project, and fund coding and decide how exceptions are resolved, including when to reject, hold, or escalate a payment. Working under the general supervision of the Accounting Supervisor, this role exercises independent judgment in administering AP policies and internal controls, analyzing and reconciling financial activity, managing tax and audit compliance, and advising staff and vendors on payment and spending matters.