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GET
Calling Add-on Slots
Read-only. Use a workspace API key (tuco_…).
Each calling add-on your workspace pays for is a slot. Add-ons ticked at checkout buy one slot for every phone line in your plan. Each phone line ordered after that takes one free slot of each add-on automatically, with no new charge. This endpoint shows what’s left.
One entry per add-on key (facetime_audio, caller_id_registration):
number
Slots of this add-on on the workspace’s subscription.
number
Lines that have this add-on (awaiting payment, setting up, or active).
number
paid minus held, never below 0. More than 0 means the next phone line gets this add-on automatically with no new charge, and adding it to an existing line with POST /api/lines/{id}/calling-addons costs nothing.
A workspace without a subscription (for example, an agency workspace billed by invoice) returns 0 for everything. The same number is on each add-on in GET /api/lines/{id}/calling-addons as prepaidFree.

Error responses