POSClient provides erc20 method which helps you to interact with an ERC20 token.

The method returns an object which has other various methods.

const erc20token = posClient.erc20(<token address>,<isRoot>);

Passing second arguments for isRoot is optional.

Child token

Token on polygon can be initiated by using this syntax -

const childERC20Token = posClient.erc20(<child token address>);

Parent token

Token on ethereum can be initiated by providing the second parameter value as true.

const parentERC20Token = posClient.erc20(<parent token address>, true);