index.html

<div id="console">
</div>
<script>
    if (window.samsungPay) {
        document.getElementById("console").innerHTML = "Samsung Pay API is supported!";
        var optionalData = {
            tranId: '123'
        };
        window.samsungPay.canMakePayment().then( response => {
            if (response) {
              document.getElementById("console").innerHTML = "Samsung Pay API canMakePayment returned true.";
            } else {
              document.getElementById("console").innerHTML = "Samsung Pay API canMakePayment returned false.";
            }
        }).catch(err => {
          document.getElementById("console").innerHTML = "Samsung Pay API canMakePayment returned error: " + err;
        });
    } else {
        document.getElementById("console").innerHTML = "Samsung Pay API is *not* supported!";
    }
</script>