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The withdrawStart method can be used to initiate the withdraw process which will burn the specified amount on polygon chain. 
const erc20Token = posClient.erc20(<child token address>);

// start withdraw process for 100 amount
const result = await erc20Token.withdrawStart(100);

const txHash = await result.getTransactionHash();

const txReceipt = await result.getReceipt();
The received transaction hash will be used to exit the withdraw process. So we recommend to store it.