IGPAPI
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    Variable ChallengeServerParamsSchemaConst

    ChallengeServerParamsSchema: Struct<
        {
            challenge_root_id: optionalKey<String>;
            INTERNAL__latency_qpl_instance_id: optionalKey<String>;
            INTERNAL__latency_qpl_marker_id: Number;
            persisted_data: optionalKey<String>;
        },
    > = ...

    A UFAC action's server_params as a screen keeps them: JSON, with the keys the extraction did not find left out — the same bytes on the wire, since the request's JSON drops an absent value either way, in the same key order.

    persisted_data is carried only by the image-captcha step, whose request merges it into the same server_params object.