All orders containing only Virtual Products: Orders that don’t have any other physical products and only have Virtual products will be marked as completed.
All Orders that have Paid Successfully: All orders (along with physical products) that successfully paid will be marked as complete.
All Orders: No matter what is the order contains or has (payment complete, virtual, physical, offline payments, etc.), as soon as a customer land on the thank you page, the order status will be changed to complete.