Although Whiplash will attempt to import newly create/updated Orders in your store by default, sometimes you'd like to do a manual import, or just confirm that we've got the order correctly.
You can do that via Integrations→Import Orders:
Here, you will see what has been imported and what has not
Note: Imported orders will be hyperlinked to Whiplash Orders.
You can choose to import selected orders, or All orders.
Note: "Import All" will import EVERY order in your store, not just the ones on the current page and is rarely advisable.