index.js

// 支払い方法の設定
var supportedInstruments = [{
    supportedMethods: ['basic-card']
    data: {
      supportedNetworks: [
        'visa', 'mastercard', 'amex', 'discover',
        'diners', 'jcb', 'unionpay'
      ]
    }
}];

// 支払い情報について
var details = {
  displayItems: [{
    label: '元値',
    amount: { currency: 'JPY', value: '6500' }
  }, {
    label: '割引',
    amount: { currency: 'JPY', value: '-1000' }
  }],
  total: {
    label: '合計',
    amount: { currency: 'JPY', value : '5500' }
  }
};

var request = new PaymentRequest(supportedInstruments, details);
request.show()