const supportedPaymentMethods = [
    {
        "supportedMethods": "basic-card"
    }
];

const paymentDetails = {
    "title": "Tickets to Venice x2",
    "total": {
        "label": "Total",
        "amount": {
            "currency": "USD",
            "value": 2000
        }
    },
    "displayItems": [],
    "shippingOptions": []
};

// Options isn't required.
const options = {
    "requestShipping": false,
    "shippingType": "delivery"
};

const request = new PaymentRequest(
    supportedPaymentMethods,
    paymentDetails,
    options
);

// Call when you wish to show the UI to the user.
request.show()
    .then((paymentResponse) => {
        console.info(paymentResponse);
        // TODO: Process payment (stripe/mastercard/etc.)
        paymentResponse.complete();
    })
    .catch((err) => {
        console.error(err);
    });