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Documentation Index

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The getAllowance method can be used to get the approved amount for the user. 
const erc20Token = posClient.erc20(<token address>, true);

const balance = await erc20Token.getAllowance(<userAddress>);

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spenderAddress

The address on which approval is given is called spenderAddress. It is a third-party user or a smart contract which can transfer your token on your behalf. By default spenderAddress value is erc20 predicate address. You can specify spender address value manually. 
const erc20Token = posClient.erc20(<token address>, true);

const balance = await erc20Token.getAllowance(<userAddress>, {
    spenderAddress: <spender address value>
});