Re: [w3c/payment-handler] window.open not working from paymentrequest eventlistener (#280)

I tried to postMessage to the popup window as per --> https://w3c.github.io/payment-handler/#post-example.  I dont see event listener getting fired on the popup window.

>From sw.js ->
self.addEventListener('paymentrequest', (evt) => {
    evt.respondWith(
        new Promise((resolve, reject) => {
            evt.openWindow("https://majaybabu.github.io/payment-handler-pay/select.html")
            .then(function(windowClient) {
                console.log('posting msg....');
                windowClient.postMessage({msg : "Hey I just got a fetch from you!"});
                resolve(JSON.parse("{\"methodName\": \"https://majaybabu.github.io/payment-handler-pay/\", \"details\": \"Hey I just got a fetch from you!\"}"));
            });
    })
);

});

popup html -

<script>
    window.addEventListener('load', function(evt) {
        console.log('received:----');
            window.addEventListener("message", function (event) {
                console.log('message received:  ' + event.data.msg);
                document.write(event.data.msg);
            });
    });

</script>



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