post https://api.circle.logi.com/api/billing/accounts//subscriptions
Create a subscription for one or more accessories by specifying the plan id. Existing AccessoryAccessory - A unique device within the system. An accessory can be any of type and is represented by a unique Accessory Id. An accessory is linked to an account via an accountId. Within this API, a singular Circle camera is an Accessory. subscriptions will be replaced and expired. Only Subscription Plans where the property isAvailable is true can be used to create new subscriptions.