index.js

const request = require('request')
const xml = require('xml')
const Parser = require('xml2js').Parser

const url = 'https://sec.paymentexpress.com/pxpost.aspx'
const uat = 'https://uat.paymentexpress.com/pxpost.aspx'

module.exports = {
  submit: (details, callback) => {
    const dpsData = {
      Txn: [
        { PostUsername: details.user },
        { PostPassword: details.password },
        { CardHolderName: details.card.name },
        { CardNumber: details.card.number },
        { Amount: details.amount },
        { DateExpiry: details.card.expiry },
        { Cvc2: details.card.cvc2 },
        { InputCurrency: details.currency || 'NZD' },
        { TxnType: details.transactionType || 'Purchase' },
        { TxnId: details.transactionId || '' },
        { MerchentReference: details.reference },
      ],
    }
    request(
      {
        uri: process.env.NODE_ENV === 'production' ? url : uat,
        method: 'POST',
        body: xml(dpsData),
      },
      (err, res, body) => {
        process.nextTick(() => {
          if (err) {
            process.nextTick(() => {
              callback(err)
            })
          } else {
            const parser = new Parser({ explicitArray: false })
            process.nextTick(() => {
              parser.parseString(body, (error, result) => {
                callback(error, result.Txn.Transaction)
              })
            })
          }
        })
      }
    )
  },
}