Quick integration
Drop this into your site, replacing the app ID with yours:
<script src="SCRIPT_ORIGIN/static/widget.js"></script>
<script>
const vultus = new Vultus("YOUR_APP_ID");
// at signup:
vultus.enroll({ payload: { userId: 123 } }).then(i => save(i.facialId));
// at login:
vultus.authenticate().then(u => signIn(u.facialId, u.payload, u.token));
</script>
Then verify token on your backend: GET SCRIPT_ORIGIN/api/token/verify?token=… with header X-App-Secret.