> ## Documentation Index
> Fetch the complete documentation index at: https://commet.co/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# addon.activated

> An add-on was activated on a subscription.

## When this fires

When an add-on activation completes — via `POST /subscriptions/{id}/addons` or a customer portal purchase. Any prorated activation charge has already succeeded; `proratedPrice` is the amount charged (zero when the remaining period was free).

`customer.state_changed` fires alongside it with trigger `addon_activated`, reflecting the feature the add-on unlocked.

Use it to enable the add-on's feature in your app the moment it is paid.


## OpenAPI

````yaml /openapi/en/webhooks/2026-08-27.json webhook addon.activated
openapi: 3.1.0
info:
  title: Commet Webhooks
  version: '2026-08-27'
  description: >-
    Outbound webhook events emitted by the Commet API. Each event is delivered
    as a signed POST to your configured endpoints.
servers: []
security: []
paths: {}

````

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