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The deposit method can be used to deposit required amount of a token from ethereum to polygon chain. 
const erc1155RootToken = posClient.erc1155(<root token address>, true);
 
const result = await erc1155RootToken.deposit({
    amount: 1,
    tokenId: '123',
    userAddress: <from address>,
    data: '0x5465737445524331313535', // data is optional
});

const txHash = await result.getTransactionHash();

const txReceipt = await result.getReceipt();
Supplying data is optional.