Single Sign On
WebUntis as the service provider
WebUntis provides the possibility to SignIn with an external User-Account. Therefore the School-Administrator have to configure the SSO-Integration.
In this case WebUntis is the Client and your application is the Identityprovider.
A documentation about it is found here: Integrationseinstellungen in WebUntis – Hilfe Center
WebUntis platform as the identity provider
If your UI is integrated via the platform, you can use the platform as an identity provider.
Further information: Authorization documentation for Integrationpartners