Google Pay

const google = overflow.googlePay({
  buttonType: 'buy',
  buttonColor: 'default',
  transaction: {
    amount: 4999,
    currency: 'USD',
    countryCode: 'US',
    label: 'Order total',
  },
  require: { email: true, billingAddress: true },
});

google.mount('#google');

overflow.googlePay({
  buttonType: 'buy',       // 'buy' | 'donate' | 'plain' | ...
  buttonColor: 'default',  // 'default' | 'black' | 'white'
});

overflow.googlePay({
  require: { billingAddress: true, phone: true },
  requirements: {
    billingAddressParameters: {
      format: 'FULL',
      phoneNumberRequired: true,
    },
  },
});

overflow.googlePay({
  transaction: {
    amount: 4999,
    currency: 'USD',
    countryCode: 'US',
    label: 'Order total',
  },
});