Sign Engine lets you collect legally binding digital signatures on PDF documents through the Embed API.
Integration
Key concepts, integration approaches, and session lifecycle.
Invitations
Notify participants by email or SMS, or share signing URLs yourself.
Webhooks
Delivery behavior, event types, and signature validation.
Audit log
Fetch session audit events to show activity or store an audit trail.
Retrieving the signed document
Download the final PDF after the session is completed.
Custom domains
Serve the Sign UI and send emails from your own domains.