IGPAPI
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    Variable ChallengeRecaptchaStepSchemaConst

    ChallengeRecaptchaStepSchema: 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>;
                },
            >;
            serverParams: Struct<
                {
                    challenge_root_id: optionalKey<String>;
                    INTERNAL__latency_qpl_instance_id: optionalKey<String>;
                    INTERNAL__latency_qpl_marker_id: Number;
                    persisted_data: optionalKey<String>;
                },
            >;
            siteKey: String;
            url: String;
        },
    > = ...

    The UFAC reCAPTCHA's step: the same params and state as any UFAC step, plus the widget the person solves — its iframe URL and site key. Without them the token cannot be produced.