Will the Scan and Order plugin deactivation affect my existing subscription?

Will the Scan and Order plugin deactivation affect my existing subscription?

Yes, deactivating the Scan and Order plugin will reduce your subscription amount for your next billing cycle. The reduction in amount will depend upon your choice of edition, number of plugin licences, and the billing cycle that you have opted for. The Cart Details on the Purchase Subscription screen clearly indicates the subscription amount from the next billing cycle. 
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 licences 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. 
To be able to subscribe to and activate the Scan and Order plugin you should first activate the Hospitality for Quick Serve and Fine Dining plugin. The plugin is already included in both the editions - Community and Enterprise. This means that you will NOT be required to purchase and subscribe to this plugin. You just have to activate the plugin from the Purchase Subscription Screen.
Activating or Deactivating this Hospitality for Quick Serve and Fine Dining plugin will not affect your subscription amount for your next billing cycle because the plugin is free.