ExamplePaymentRequest.js

var methods = ["//android.com/pay", "visa", "mastercard", "amex", "discover"];
var request = {
  "items": [
    {
      "id": "basket",
      "label": "Sub-total",
      "amount": {
        "currencyCode": "USD",
        "value": "55.00"
      }
    },
    {
      "id": "tax",
      "label": "Sales tax",
      "amount": {
        "currencyCode": "USD",
        "value": "5.00"
      }
    },
    {
      "id": "total",
      "label": "Total due",
      "amount": {
        "currencyCode": "USD",
        "value": "60.00" // This amount is always total shown
      }
    }
  ],
  shippingOptions: [
    {
      "id": "free",
      "label": "Free Shipping!",
      "amount": {
        "currencyCode": "USD",
        "value": "0.00"
      }
    }
  ]
}; 
var options = {
  requestShipping: true
};
var methodData = {
  "//android.com/pay": {
    "gateway": "stripe",
    "stripe:publishableKey": "pk_test_VKUbaXb3LHE7GdxyOBMNwXqa",
    "stripe:version": "2015-10-16 (latest)"
  }
};

var pr = new PaymentRequest(methods, request, options, methodData);

pr.show().then(function(paymentResponse) {
  console.log(paymentResponse);
  paymentResponse.complete(true);
}).catch(function(err) {
  console.log("I am sad", err.message);
});