FB Marketing API Question

gistfile1.js

'use strict'

const bizSdk = require('facebook-nodejs-business-sdk')

const accessToken = 'xxx'
const accountId = 'act_xxx'

const AdAccount = bizSdk.AdAccount
const Campaign = bizSdk.Campaign
const AdSet = bizSdk.AdSet

module.exports = () => {
  const FacebookAdsApi = bizSdk.FacebookAdsApi.init(accessToken)
  const account = new AdAccount(accountId)
  const adSetFields = Object.values(AdSet.Fields)

  return account
    .read([AdAccount.Fields.name])
    .then(account => {
      return account.getCampaigns([Campaign.Fields.name], { limit: 1 }) 
    })
    .then(result => {
      const campain = result[0]
      console.log(campain)

     return campain.getAdSets(adSetFields).then(console.log) // The ad account and app id must be whitelisted


    })
    .catch(err => {
      console.error('+++', err.message)

      return Promise.resolve('stop')
    })
}