How to use the algosdk.Algodv2 function in algosdk

// Both algodclient objects are necessary, as the params call is application/json and the SDK does not allow by request header assignment
// The TestNet account in this example is U2VHSZL3LNGATL3IBCXFCPBTYSXYZBW2J4OGMPLTA4NA2CB4PR7AW7C77E - PureStake cannot guarantee any funds will exist to execute this example
// To add Algo's - https://bank.testnet.algorand.network

// Updated for v2 1/20/21 


const algosdk = require('algosdk');
const baseServer = "https://testnet-algorand.api.purestake.io/ps2"
const port = "";
const token = {
    'X-API-key': 'B3SU4KcVKi94Jap2VXkK83xx38bsv95K5UZm2lab',
}


const algodclient = new algosdk.Algodv2(token, baseServer, port);

var mnemonic = "code thrive mouse code badge example pride stereo sell viable adjust planet text close erupt embrace nature upon february weekend humble surprise shrug absorb faint";
var recoveredAccount = algosdk.mnemonicToSecretKey(mnemonic);
console.log(recoveredAccount.addr);

(async () => {
    //Get the relevant params from the algod
    let params = await algodclient.getTransactionParams().do();

    // move the TEAL  program into Uint8Array
    let program = new Uint8Array(Buffer.from("ASABASI=", "base64"));
    let lsig = algosdk.makeLogicSig(program);
    lsig.sign(recoveredAccount.sk);


    //create a transaction

// Algorand Algod (v2) example 
// Send transaction on TestNet

const algosdk = require('algosdk');
const baseServer = "https://testnet-algorand.api.purestake.io/ps2";
const port = "";

const token = {
    'X-API-key' : 'B3SU4KcVKi94Jap2VXkK83xx38bsv95K5UZm2lab',
}

let algodClient = new algosdk.Algodv2(token, baseServer, port);

(async() => {

    let params = await algodClient.getTransactionParams().do();
    
    let amount = Math.floor(Math.random() * 1000);
    var mnemonic = "code thrive mouse code badge example pride stereo sell viable adjust planet text close erupt embrace nature upon february weekend humble surprise shrug absorb faint"; 
    var recoveredAccount = algosdk.mnemonicToSecretKey(mnemonic); 
    
    let txn = {
        "from": recoveredAccount.addr,
        "to": "UUOB7ZC2IEE4A7JO4WY4TXKXWDFNATM43TL73IZRAFIFFOE6ORPKC7Q62E",
        "fee": 1,
        "amount": amount,
        "firstRound": params.firstRound,
        "lastRound": params.lastRound,