You have been assigned to audit the accounts payable of an audit client where there is a high risk of material misstatement related to accounts payable. Control risk is high, management integrity is marginal, and the company is near violation of important loan covenants, particularly one that requires the maintenance of a minimum working. capital ratio. Explain how you would approach the year-end audit of accounts payable, including a discussion of specific substantive audit procedures and the importance of professional skepticism.