How will I know if a new order has been placed?

How will I know if a new order has been placed?

When a new Table Order is placed, you will see a pop up for the new order in the notification section on the Web Register. A corresponding entry for the new order is recorded under Recent Sales as a Suspended Transaction. 

Plugins in Tagrain are either Subscription Based or License Based. So the price that you pay for your plugins is based on the number of POS terminals that you have in your setup and the number of licenses that you have acquired.
There will be no change in your subscription amount in the current billing cycle if you are only deactivating the Scan and Order plugin AND not updating your Store / POS count.