generated: '2026-09-07'
method: searched
source: https://docs.toapis.com/docs/cn/api-reference/webhooks/task-webhooks.md
type: webhook-catalog
notes: >-
  ToAPIs documents a signed webhook surface for async image/video generation tasks
  but publishes no AsyncAPI document, so this captures the webhook catalog only.
  Only final-state events are sent (no intermediate progress events). Delivery is
  at-least-once: the event id stays stable across retries and receivers must
  deduplicate on it before executing side effects.
delivery:
  guarantee: at-least-once
  dedupe_key: id (event ID, stable across retries)
  retry_schedule: immediate, then ~10s, 30s, 2m, 10m, 1h, 6h, 24h
  success_criteria: 2xx response only (3xx not followed; 4xx and 5xx both retried)
  timeout: 10s per delivery; at most 4KB of response body read for diagnostics
  transport: HTTPS only; userinfo/fragment/private, loopback, link-local and
    reserved addresses rejected; DNS/IP re-validated per delivery (SSRF/DNS-rebinding
    protection)
configuration: >-
  Configured per token in the console: HTTPS default callback URL + a 32-byte
  signing secret (shown once). A request-level callback_url may override only the
  path and query of the token default (scheme/host/port must match). Passing
  callback_url without webhook configuration returns error code
  webhook_not_configured.
signature:
  headers:
    - User-Agent: ToAPIs-Webhook/1.0
    - X-ToAPIs-Webhook-Id
    - X-ToAPIs-Webhook-Timestamp
    - X-ToAPIs-Webhook-Signature: 'v1=<current>[,v1=<previous>]'
  algorithm: HMAC-SHA256 (lowercase hex) over 'event_id + "." + timestamp + "." + raw_request_body'
  timestamp_tolerance: reject first deliveries older/newer than 5 minutes
  key_rotation: for 24h after rotation both current and previous key signatures are sent
events:
  - name: generation.completed
    description: Async image or video generation task finished successfully.
    payload_fields: [id, type, api_version, created_at, data.task_id, data.client_business_id, data.task_type, data.model, data.status, data.progress, data.result, data.error, data.submitted_at, data.finished_at]
  - name: generation.failed
    description: >-
      Task failed after all internal retries ended and final billing/refund
      completed; transient failures never trigger it.
  - name: endpoint.test
    description: Console-triggered test event to verify the receiving endpoint.
constraints:
  - task_type is only image or video
  - result matches the task-status query response and never includes channel IDs, upstream task IDs, upstream secrets or PrivateData
  - result URLs expire (download promptly; docs elsewhere state 24 hours)
  - Seedance real-person verification callback_url, payment webhooks and OAuth callbacks are separate surfaces, not task webhooks