IGPAPI
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    Variable ChallengeUfacFlowStepSchemaConst

    ChallengeUfacFlowStepSchema: Struct<
        {
            flow: Struct<
                {
                    authenticity_product: optionalKey<Number>;
                    challenge_root_id: optionalKey<String>;
                    enrollment_id: optionalKey<Number>;
                    external_flow_id: optionalKey<Number>;
                    hashed_ui_state: optionalKey<String>;
                    ig_container_module: optionalKey<String>;
                    is_blocking: optionalKey<Number>;
                    ixt_initial_screen_id: optionalKey<String>;
                    location: optionalKey<String>;
                    trigger_event_type: optionalKey<String>;
                    trigger_session_id: optionalKey<String>;
                    v2_polling: optionalKey<Number>;
                },
            >;
        },
    > = ...

    A UFAC step whose requests derive their parameters from the accumulated state alone (the authenticity wizard and the awaiting-review poll).