var eventMethod = window.addEventListener "addEventListener" : "attachEvent"; var eventer = window[eventMethod]; var messageEvent = eventMethod === "attachEvent" ? "onmessage" : "message"; eventer(messageEvent, function (e) { if (e.data === 'iframe_process_complete') { console.log('Complete iframe registration'); return; } try { const data = JSON.parse(e.data); window.location.href = data.redirectUrl; } catch (error) { // failed } });