There are two possible integration workflows with the supplier.
Dropshipping integration consists in directly shipping goods from the supplier of the Magento to the end customer.
Every time an order containing products from the supplier is payed, the system automatically creates an order to the supplier without any effort from the Woocommerce administrator.
With Dropshipping integration products will be reserved when the order status become
pending_payment (which corresponds to the phase between the placement of the order and the actual confirmation of the payment) and the single order will be automatically sent to the supplier with the shipping details of the customer to be shipped directly to.