sos-nextjs/pages/store/checkout/complete.js

import {DateTime} from 'luxon'

CheckoutComplete.getInitialProps = async function({ctx: {query: {session_id}, axios}}){
  const {data: orders} = await axios.get('/api/orders')

  const mostRecentOrder = orders.sort(sortOrders)[0]

  return {order: mostRecentOrder}
}

export default function CheckoutComplete({order}){
  return (
    <pre>
      {JSON.stringify(order, null, 2)}
    </pre>
  )
}

function parsePaymentTime({payment}){
  if(typeof payment.time === 'string')
    payment.time = DateTime.fromISO(payment.time)
  return payment.time
}

function sortTransactions(a,b){
  const timeA = parsePaymentTime(a)
  const timeB = parsePaymentTime(b)

  return timeB.diff(timeA).as('seconds')
}

function sortOrders(a,b){
  const timePaidA = parsePaymentTime(a.transactions.sort(sortTransactions)[0])
  const timePaidB = parsePaymentTime(b.transactions.sort(sortTransactions)[0])

  return timePaidB.diff(timePaidA).as('seconds')
}