The withdrawExitFasterMany method can be used to exit the withdraw process by using the txHash from withdrawStartMany method.

It is fast because it generates proof in the back-end. You need to configure setProofAPI.

Note- withdrawStart transaction must be checkpointed in order to exit the withdraw.

const erc721RootToken = posClient.erc721(<root token address>, true);

const result = await erc721RootToken.withdrawExitFasterMany(<burn tx hash>);

const txHash = await result.getTransactionHash();

const txReceipt = await result.getReceipt();