Universign API Guide This document describes the Universign's API and the request mode. universign-guide-8.113.0.pdf 500 KB Download Related articles Universign web app guide IP addresses of Universign servers Why and how can I revoke my certificate? Can the Universign service authenticate the identity of the signatories? What is the difference between the "Observer" role and the "Signatory" role in a signature collection?