Close Outcome Token Accounts

const userPublicKey = keypair.publicKey.toBase58();

// Optional: reuse the address you set when creating the order.
// If you did not set one, default to the user's wallet.
const outcomeAccountRentRecipient =
  storedOrderParams?.outcomeAccountRentRecipient ?? null;

const rentDestination = outcomeAccountRentRecipient ?? userPublicKey;

import {
  Connection,
  PublicKey,
  Transaction,
  sendAndConfirmTransaction,
} from "@solana/web3.js";
import {
  getAccount,
  createBurnInstruction,
  createCloseAccountInstruction,
} from "@solana/spl-token";

const connection = new Connection(SOLANA_RPC_URL, "confirmed");
const owner = keypair; // signer and token account owner

const tokenAccount = new PublicKey("OUTCOME_TOKEN_ACCOUNT");
const outcomeMint = new PublicKey("OUTCOME_TOKEN_MINT");
const rentRecipient = new PublicKey(rentDestination);

const account = await getAccount(connection, tokenAccount);

const instructions = [];
if (account.amount > 0n) {
  instructions.push(
    createBurnInstruction(
      tokenAccount,
      outcomeMint,
      owner.publicKey,
      account.amount
    )
  );
}

instructions.push(
  createCloseAccountInstruction(
    tokenAccount,
    rentRecipient,
    owner.publicKey
  )
);

const tx = new Transaction().add(...instructions);
await sendAndConfirmTransaction(connection, tx, [owner]);