document.addEventListener("DOMContentLoaded", () => {
        const AFF_SUB4 = "zta-pwd-iframe-all";
        const RECHECK_TIME = "60000";

        const isComplete = async() => {
            const resp = await fetch('/tracking/progress.php?aff_sub4=${AFF_SUB4}')
            const json = await resp.json()

            if (json && json.complete) {
                window.location.replace('/tracking/unlock.php?aff_sub4=${AFF_SUB4}')
                return
            }

            setTimeout(isComplete, RECHECK_TIME) // This will re-run after the specified recheck time.
        }
        isComplete();
    })