code: function initMatic() {
    if (!matic) {
      matic = new Matic({
        maticProvider: process.env.MATIC_PROVIDER,
        parentProvider: process.env.PARENT_PROVIDER,
        rootChainAddress: process.env.ROOTCHAIN_ADDRESS,
        maticWethAddress: process.env.MATIC_WETH_ADDRESS,
        syncerUrl: process.env.SYNCER_URL,
        watcherUrl: process.env.WATCHER_URL,
        withdrawManagerAddress: process.env.WITHDRAWMANAGER_ADDRESS,	
      })
  
      matic.wallet = '<private-key>' // your private key
    }
  }
docs: Create sdk instance