initiate-withdraw.js

const Matic = require('maticjs').default
const config = require('./config')

const mtoken = '0x343461c74133E3fA476Dbbc614a87473270a226c' // test token address
const amount = '10000000000000000' // amount in wei (0.01 TEST)
const from = '0xdcd53258BA8A69C6a505300BE75447A772bFd3d6' // from address

// Create object of Matic
const matic = new Matic({
 maticProvider: config.MATIC_PROVIDER,
 parentProvider: config.PARENT_PROVIDER,
 rootChainAddress: config.ROOTCHAIN_ADDRESS,
 syncerUrl: config.SYNCER_URL,
 watcherUrl: config.WATCHER_URL,
})

matic.wallet = '0x' + config.PRIVATE_KEY // prefix with `0x`

var transactionHash = null

matic
 .startWithdraw(mtoken, amount, {
   from,
   onTransactionHash: txHash => {
     transactionHash = txHash
     console.log("Withdraw Initiated")
     console.log(transactionHash)
   },
 })