Job finished

POSTed to the job’s callback_url when it reaches succeeded, failed or canceled. Carries no document or results: fetch them with GET /v1/jobs/{id}/result. Verify the Formfill-Signature: t=<unix>,v1=<hex> header: HMAC-SHA256 of "<t>.<raw body>" with your organization’s signing secret; reject timestamps older than 5 minutes. Respond 2xx; otherwise delivery is retried with backoff for up to 12 hours.