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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.

Child token

The token on Polygon can be initiated by using this syntax -

const childERC20Token = posClient.erc1155(<child token address>);

Parent token

The token on Ethereum can be initiated by providing second parameter value as true.

const parentERC20Token = posClient.erc1155(<parent token address>, true);