The main use of this plugin “Order Approval for WooCommerce” is to reduce the refund requests due to “Out of Stock”. This plugin also servers to filter the genuine orders by enabling approval process for a specific customers group or for list of some shipping methods or even based on the order total. So, when an order is placed by a customer, admin will get an email notification. Admin then verify the order and can approve or reject it. If the order is approved by admin, then the customer will receive an email notification with the link to complete the payment. If admin rejects the order then a cancellation email will be sent to the customer.