---
title: "The creator downgrades to a lower Subscriby tier."
method: POST
path: "billing.tier_downgraded"
tags: ["billing.* events"]
---

# The creator downgrades to a lower Subscriby tier.

`POST billing.tier_downgraded` (webhook)

### When this fires

The creator switches their Subscriby subscription to a lower tier. The change lands at the end of the period they have already paid for, not at `effective_at`: the current phase runs to its existing end date and the lower tier begins after it.

### Caveats

- `effective_at` is stamped at emission time and is never in the future, even when the provider defers the billing change to the next renewal boundary. Do not use it to schedule feature revocation.
- Tier-locked features (Teams, custom roles, etc.) may become read-only or hidden once the current paid period ends, never at `effective_at`.

### Related events

- `billing.tier_upgraded`: opposite direction.
- `billing.tier_cancelled`: terminal downgrade path.

## Headers

- `SB-Signature` string, required
- `SB-Event-Id` string, required
- `SB-Event-Name` string, required
- `Content-Type` string, required
- `User-Agent` string, required

## Payload

- object: The envelope every event is delivered in.
  - `id` string, required: A ULID unique to the event, prefixed `evt_`. Every retry carries the same id, so it is the key to deduplicate on.
  - `type` 'billing.tier_downgraded', required: The event name, always `billing.tier_downgraded` here.
  - `created_at` string, date-time, required: When the event was emitted, server time, ISO 8601.
  - `api_version` string, required: The contract version of the payload shape, `2026-05-01` today. A breaking change to a shape ships under a new version.
  - `project_id` string, uuid, nullable, required: The project the event belongs to; null for team-scoped and billing events.
  - `data` object, required: The event-specific payload. Keys that do not apply to a given emission are omitted rather than sent as null, so check for presence.
    - `creator_id` string, uuid, required: Creator whose tier changed.
    - `from_tier` string, uuid, required: Previous tier **plan id**. Always present: a first subscription emits no tier event.
    - `to_tier` string, uuid, required: New tier **plan id**.
    - `effective_at` string, date-time, required: Always the emission time, **never** a future date.

## Acknowledgement `2XX`

Your endpoint acknowledged the delivery. Any 2xx status within 30 seconds marks it delivered; the response body is ignored.

## Other responses

- `default`: Any other status, a connection failure, or no answer within 30 seconds counts as a failed attempt. The delivery is retried 8 times, after 10 seconds, 30 seconds, 2 minutes, 10 minutes, 1 hour, 6 hours, 1 day, 3 days; the last failure dead-letters it, and it can be retried from the dashboard or `POST /v1/webhook-deliveries/{delivery}/retry`. After 20 consecutive failures the endpoint is paused until it is resumed.

---

[API](https://skmtc.dev/memberpass/apis/subscriby-rest-api.md) · [All operations](https://skmtc.dev/memberpass/apis/subscriby-rest-api/llms.txt) · [OpenAPI document](https://skmtc.dev/memberpass/apis/subscriby-rest-api/revisions/59c4df91d764?raw)