Shipping configuration in express methods

const ORIGINAL_AMOUNT = 10;

const US_SHIPPING = [
  {
    id: 'free-shipping',
    label: 'Free shipping',
    description: 'Arrives in 5 to 7 days',
    amount: 0,
  },
];

const INTERNATIONAL_SHIPPING = [
  {
    id: 'international-shipping',
    label: 'International shipping',
    description: 'Arrives in 20 to 30 days',
    amount: 10,
  },
];

Framepay.initialize({
  publishableKey: 'pk_sandbox_123',
  organizationId: 'org-123',
  websiteId: 'website-123',
  transactionData: {
    currency: 'USD',
    amount: ORIGINAL_AMOUNT,
    label: 'Demo purchase label'
    requestShipping: true,
    shippingOptions: {
        defaultSelectedOptionId: 'free-shipping',
        options: [
            ...US_SHIPPING,
            ...INTERNATIONAL_SHIPPING,
        ],
    }
  },
});

Framepay.on('shipping-address-changed', (shippingAddress, updateShippingOptions) => {
  if (shippingAddress.country === 'US') {
    updateShippingOptions({ status: 'success', shippingOptions: US_SHIPPING });
  } else {
    updateShippingOptions({
        status: 'success',
        shippingOptions: INTERNATIONAL_SHIPPING,
        lineItems: [
            {
                label: 'Shipping',
                amount: shippingOption.amount,
            },
            {
                label: 'Tax',
                amount: '10.99',
            },
        ],
    });
  }
});

Framepay.on('shipping-option-changed', (shippingOption, updateTransaction) => {
  updateTransaction({
    amount: ORIGINAL_AMOUNT + shippingOption.amount,
    lineItems: [
        {
            label: 'Shipping',
            amount: shippingOption.amount,
        },
        {
            label: 'Tax',
            amount: '10.99',
        }
    ],
  });
});