> ## 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.

# trial.will_end

> Predictive event fired once, 3 days before a trial ends.

## When this fires

A daily scan finds trials ending within the next 3 days and emits this event once per trial. The idempotency key is derived from the subscription and the trial end date, so re-running the scan never sends a duplicate.

Use it to remind the customer that billing starts on `trialEndsAt` — the single most effective moment to prevent involuntary churn and surprise charges.

If the trial end date changes after this event fired (for example, the customer converts early), `trial.converted` or `trial.expired` reflects the final outcome.


## OpenAPI

````yaml /openapi/en/webhooks/2026-08-27.json webhook trial.will_end
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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