public SamlAssertionConsumerConfigBuilder acs(SamlEndpoint endpoint) {
        final SamlAssertionConsumerConfigBuilder config =
                new SamlAssertionConsumerConfigBuilder(this, requireNonNull(endpoint, "endpoint"));
        acsConfigBuilders.add(config);
        return config;
    }
Returns a {@link SamlAssertionConsumerConfigBuilder} to configure a new assertion consumer service
of this service provider.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlServiceProviderBuilder.java