depositerc20.js

        const Network = require("@maticnetwork/meta/network");
        const Matic = require("@maticnetwork/maticjs").default;
   
        
        const network = new Network("testnet","v3");
        const MaticNetwork = network.Matic;
        const MainNetwork = network.Main;
        
        const Ropsten_Erc20Address = '0xec5c207897c4378658f52bccce0ea648d1f17d65'; 
    
        
        const from = '0x8727aff41b503b4c01d757391d3b3a9d38b67dcd'; // from address
        
        const matic = new Matic({
          maticProvider: MaticNetwork.RPC,
          parentProvider: MainNetwork.RPC,
          rootChain: MainNetwork.Contracts.RootChain,
          withdrawManager: MainNetwork.Contracts.WithdrawManagerProxy,
          depositManager: MainNetwork.Contracts.DepositManagerProxy,
          registry: MainNetwork.Contracts.Registry  
        });
        
        async function init() {
          await matic.initialize();
          await matic.setWallet('0xE86F1698548CFC955C3B3556DFB2C8F35FEB6EA5B35AB90608CBC6B04B9F700F');
        }
        
        async function PromiseTimeout(delayms) {
          return new Promise(function(resolve, reject) {
            setTimeout(resolve, delayms);
          });
        }
        
        async function demoErc20() {
          await init();
          const amount = "100000000000000000"; // amount in wei
          console.log("*****Deposit ERC20*****");
        
          let token = Ropsten_Erc20Address;
        
          await matic
            .approveERC20TokensForDeposit(token, amount, {
              from
            })
            .then(async logs => {
              console.log("Approve on Ropsten:" + logs.transactionHash);
              await PromiseTimeout(10000);
              await matic
                .depositERC20ForUser(token, from, amount, {
                  from  
                })
                .then(async logs => {
                  console.log("Deposit on Ropsten:" + logs.transactionHash);
                  await PromiseTimeout(10000);
                  
                      
                });
            });
        }
        
demoErc20();