When the Purchase Order is approved, it is then sent to the vendor via an automatic email sent from ProcessMaker. All the vendor needs to do is simply open the email and either approve or deny the purchase order request. This way, the originator does not need to create a ProcessMaker user for vendors and external users can easily participate in approvals. If the purchase order is denied by the vendor, it is sent back to the requestor. In the case it is approved, then ProcessMaker automatically generates a purchase order agreement in the next step of the process.