XUMM SDK: payload create & subscribe, await signed payload & retrieve user token (to Push our next payload)

index.js

const {XummSdk} = require('xumm-sdk')
const Sdk = new XummSdk('xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx', '...')

const main = async () => {
  const appInfo = await Sdk.ping()
  console.log(appInfo.application.name)

  // Please change the destination account to an account (and possibly: DestinationTag) 
  // you own, or you'll be testing sending a small amount of XRP to the XRPL Labs team ;)
  
  const request = {
    "TransactionType": "Payment",
    "Destination": "rwietsevLFg8XSmG3bEZzFein1g8RBqWDZ",
    "Amount": "10000",
    "Memos": [
      {
        "Memo": {
          "MemoData": "F09F988E20596F7520726F636B21"
        }
      }
    ]
  }

  const subscription = await Sdk.payload.createAndSubscribe(request, event => {
    console.log('New payload event:', event.data)

    if (event.data.signed === true) {
      // No need to console.log here, we'll do that below
      return event.data
    }

    if (event.data.signed === false) {
      // No need to console.log here, we'll do that below
      return false
    }
  })

  console.log(subscription.created)

  /**
   * Now let's wait until the subscription resolved (by returning something)
   * in the callback function.
   */
  const resolveData = await subscription.resolved

  if (resolveData.signed === false) {
    console.log('The sign request was rejected :(')
  }

  if (resolveData.signed === true) {
    console.log('Woohoo! The sign request was signed :)')

    /**
     * Let's fetch the full payload end result, and get the issued
     * user token, we can use to send our next payload per Push notification
     */
    const result = await Sdk.payload.get(resolveData.payload_uuidv4)
    console.log('User token:', result.application.issued_user_token)
  }  
}

main()