Update signing request properties, a single recipient, OR a single field. Cannot update multiple entity types in one request. Cannot update after signing request has been sent, completed, or cancelled.
API key for authentication. Use your API key directly without any prefix (e.g., 'your-api-key'). Bearer prefix is optional but not required.
Signing request ID
Update signing request properties only
Signing request updated successfully. Response shape depends on what was updated: properties update returns {id, name, template_description, document_url, expiration_hours}; recipient update returns the full recipient object; field update returns the full field object. Response may include a 'warning' field for email format validation warnings (non-blocking).