amazone/server/routes/payment.js

const router = require('express').Router()
const moment = require('moment')

const SHIPMENT = {
  normal: {
    price: 13.98,
    days: 7
  },
  fast: {
    price: 49.98,
    days: 3
  }
}

function shipmentPrice (shipmentOption) {
  let estimated = moment().add(shipmentOption.days, 'd').format('dddd MMMM Do')
  return {
    estimated,
    price: shipmentOption.price
  }
}

router.post('/shipment', (req, res) => {
  let shipment;
  if (req.body.shipment === 'normal') {
    shipment = shipmentPrice(SHIPMENT.normal)
  } else {
    shipment = shipmentPrice(SHIPMENT.fast)
  }

  res.json({
    success: true,
    shipment
  })
})
module.exports = router