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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.