I need a context DFD and flowcharts plz!!

The accounts payable department of the AIS Company pays a vendor invoice, only after the invoice has been matched against the purchase order received from purchasing department and the receiving report that the receiving department prepares. All three documents enter accounts payable department at different times.

The purchase orders that are forwarded from purchasing are stored in a purchase order file by date. The receiving reports are stored in a receiving report file alphabetically. When vendor invoices are received, the accounts payable clerk records the amount due in the accounts payable file and files the invoices in the vendor invoice file alphabetically. The department also prepares monthly accounts payable reports from the accounts payable ledger for the controller.

The company also has a policy to pay all accounts within 10 days to take advantage of early-payment discounts. When it is time to pay a bill, the accounts payable clerk retrieves the vendor invoice, attaches the purchase order and the receiving report, and forwards the matched documents to the controller.

The controller reviews the documents to ensure they are complete, prepares a two-part check, forwards all the documents to the owner/manager, and records the check in the cash disbursement journal.

The owner/manager reviews the documents to ensure that they are valid payables and signs the checks; then sends he check to the vendor and files the documents and the copy of the check numerically.