IdP Server is a generic federated identity provider (IdP). It allows to authenticate any user from a SP client.
With this component when the users access to a web portal with Single Sign-on from an SP client, they are redirected to a web page of this component (known as the enterprise's login manager) where they are prompted to enter their enterprise user name and password. Upon verification of the user’s cresentials, the component informs the SP client of the verified identity for the user who is logging in, and the user is redirected back to the end user portal website.
The IdP server supports SAML 2.0 protocol.
Also supports APIs for authentication (though SAML 2.0 messages) for any mobile app (OutSystems mobile apps no longer requires InApp browser plugins alongside with this IdP server).

Tested with some SP clients like IdP connector and SimpleSAML