Subscription Service
Introduction
The subscription service is in charge of Subscription related actions such as Plan fetch, Plan Subscription or Plan cancelation.
When a Web-managed subscription has a deferred pendingSwitch, the account screen presents the
incoming plan as a separate row. Cancelling that row calls
DELETE /subscriptions/{orderId}/pending-switch; it cancels only the queued Cleeng switch and
keeps the active subscription. Cancelling the active subscription remains a separate action.