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POSClient provides erc1155 method which helps you to interact with a erc1155 token. The method returns instance of ERC1155 class which contains different methods. 
const erc721token = posClient.erc1155(<token address>, <isRoot>);
Passing second arguments for isRoot is optional.

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Child token

The token on Polygon can be initiated by using this syntax - 
const childERC20Token = posClient.erc1155(<child token address>);

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Parent token

The token on Ethereum can be initiated by providing second parameter value as true. 
const parentERC20Token = posClient.erc1155(<parent token address>, true);