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).