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Documentation Index

Fetch the complete documentation index at: https://docs.polygon.technology/llms.txt

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The approve method can be used to approve required amount on root token. 
const erc721RootToken = posClient.erc721(<root token address>,true);

const approveResult = await erc721RootToken.approve(<token id>);

const txHash = await approveResult.getTransactionHash();

const txReceipt = await approveResult.getReceipt();