Blackwood, CPA, is engaged in the audit of King Suppliers Inc. for the year ending December 31, 2020. Blackwood obtained an understanding of internal control relating to the purchasing, receiving, trade accounts payable, and cash disbursements cycle, and has decided not to proceed with tests of controls. Based on analytical procedures, Blackwood believes that the trade accounts payable on the balance sheet date of December 31, 2020, may be understated.

Blackwood requested and obtained a client-prepared trade accounts payable schedule listing the date of each invoice and the total amount owed to each vendor.

Required:

What substantive audit procedures should Blackwood apply in examining the trade accounts payable?

please help