generated: '2026-07-19'
method: searched
source: https://developers.hellosign.com/docs/guides/events-and-callbacks/
spec_type: Webhooks
note: Dropbox Sign delivers events as multipart/form-data POST requests to a user-defined callback URL.
  No AsyncAPI document is published; this is the webhook/event catalog from the OpenAPI Callbacks-and-Events
  surface.
delivery:
  transport: multipart/form-data POST
  field: json (EventCallbackRequest payload)
  verification: event_hash = HMAC-SHA256 over event_time + event_type, keyed by the API key
configuration:
- level: account
  sets: Account-level callback URL for Signature Request and Template events.
- level: api_app
  sets: Per API App callback URL for Signature Request, Template, and Account events.
event_types:
- account_confirmed
- unknown_error
- file_error
- sign_url_invalid
- signature_request_viewed
- signature_request_signed
- signature_request_sent
- signature_request_all_signed
- signature_request_email_bounce
- signature_request_remind
- signature_request_incomplete_qes
- signature_request_destroyed
- signature_request_canceled
- signature_request_downloadable
- signature_request_declined
- signature_request_reassigned
- signature_request_invalid
- signature_request_prepared
- signature_request_expired
- template_created
- template_error
- callback_test
- signature_request_signer_removed