keycloak-scim/docbook/saml-adapter-docs/reference/en/en-US/modules/idp-registration.xml

<chapter id="idp-reg">
    <title>Registering with an IDP</title>
    <para>
        For each servlet based adapter, the endpoint you register for the assert consumer service url and and single logout service
        must be the base url of your servlet application with <literal>/saml</literal> appended to it i.e. https://example.com/contextPath/saml
    </para>
</chapter>