keycloak-scim/docbook/auth-server-docs/reference/en/en-US/modules/social-spi.xml

<section id="social-spi">
    <title>Social Provider SPI</title>
    <para>
        Keycloak provides an SPI to make it easy to add additional social providers. This is done by implementing
        <literal>org.keycloak.social.SocialProvider</literal> in <literal>social/core</literal>
        and adding a provider configuration file (<literal>META-INF/services/org.keycloak.social.SocialProvider</literal>).
    </para>
    <para>
        A good reference for implementing a Social Provider is the Google provider which you can find in <literal>social/google</literal>
        on GitHub or in the source download.
    </para>
</section>