What to mention in place of 'chain' on Tx declaration for polygon testnet?

I have working code for ethereum signed transaction with ropsten test net, now i deployed same project and trying to interact with below code but i am facing problems

var Tx = require(‘ethereumjs-tx’).Transaction;
var privateKey = Buffer.from(‘e331b6d69882b4cb4ea581d88e0b604039a3de5967688d3dcffdd2270c0fd109’, ‘hex’);

var rawTx = {
nonce: ‘0x00’,
gasPrice: ‘0x09184e72a000’,
gasLimit: ‘0x2710’,
to: ‘0x0000000000000000000000000000000000000000’,
value: ‘0x00’,
data: ‘0x7f7465737432000000000000000000000000000000000000000000000000000000600057’

var tx = new Tx(rawTx, {‘chain’:‘ropsten’});

var serializedTx = tx.serialize();

web3.eth.sendSignedTransaction(‘0x’ + serializedTx.toString(‘hex’))
.on(‘receipt’, console.log);

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solved the problem
Thanks for your suggestion @Annie_MaticDev

but no one responded in chat

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What you do i am also facing same issue

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Hi @Priyanshu_Vijay I will suggest you contact matic support, a representative from Matic will further escalate this issue via the live chat support. Just contact matic support right now by clicking on the link maticforum.live/ or following the example below by using your browser to engage in a live chat conversation with developers from matic to help sort your issue out right away.

what did you mention in place of chain?

Solved this !! Below code snippet worked for me. :grin: :+1:
Only if @A_Nani would have commented his solution it would have saved a lot of time. :angry:

import Common from 'ethereumjs-common';

const common = Common.forCustomChain(
        name: 'matic-mumbai', //polygon-mainnet
        networkId: 80001, //137
        chainId: 80001, //137

const transaction = new Tx(rawTransaction, {