You are trying to understand the following business operation. Use Business Process Modeling Notations (BPMN) to document the business process below.

The purchase department initiates the purchasing process by receiving the approved purchase requisition. Based on the purchase requisition, the purchase department prepares a purchase order. The purchase order is then sent to the vendor. The vendor process the purchase order and sent the product to the warehouse of the document with an invoice to the accounts payable department. The warehouse receives, examines the products, and prepare a receiving report. The warehouse sends the receiving report to the accounts payable department. The accounts payable department compares the purchase order, the invoice, and the receiving report. If all the three documents match, the accounts payable department notify the cashier. The cashier pays the vendor. If not, the cashier notifies the purchase department and the warehouse.