Will the Customer Facing Display plugin deactivation affect my existing subscription?

Will the Customer Facing Display plugin deactivation affect my existing subscription?

Yes, deactivating the Customer Facing Display 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. 
The Customer Facing Display plugin is licensed based and its pricing is based on the number of stores in your environment. This means that when you license this plugin, it will be applicable to all the stores in your environment.
The Tagrain Customer Facing Display application is available on both - Android and iOS and can be downloaded from the respective App stores.