hts/updateTokenFeeSchedule

const snapId = `npm:@hashgraph/hedera-wallet-snap`

const initiateSwapAPI = async () => {
  const externalAccountParams = {
    externalAccount: {
      accountIdOrEvmAddress: '0.0.12345',
      curve: 'ED25519'
    }
  }

  const tokenCustomFee = {
    feeCollectorAccountId: '0.0.35453',
    hbarAmount?, // Optional param - type number - Set the amount of HBAR to be collected
    tokenAmount?, // Optional param - type number - Sets the amount of tokens to be collected as the fee
    denominatingTokenId?, // Optional param - type string - The ID of the token used to charge the fee. The denomination of the fee is taken as HBAR if left unset
    allCollectorsAreExempt?, // Optional param - type boolean - If true, exempts all the token's fee collector accounts from this fee
  }

  await window.ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId,
      request: {
        method: 'hts/updateTokenFeeSchedule',
        params: {
          network: 'testnet',
          tokenId: '0.0.4535645',
          customFees: [tokenCustomFee],
          /* 
            Uncomment the below line if you want to connect 
            to a non-metamask account
          */
          // ...externalAccountParams
        }
      }
    }
  })
}

{
    "currentAccount": {
        "metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
        "externalEvmAddress": "",
        "hederaAccountId": "0.0.3581604",
        "hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
        "publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
        "balance": {
            "hbars": 88.13421155,
            "timestamp": "Fri, 26 Apr 2024 17:50:12 GMT",
            "tokens": {
                "0.0.4279119": {
                    "balance": 50,
                    "decimals": 1,
                    "tokenId": "0.0.4279119",
                    "name": "NewTuum",
                    "symbol": "NEWTUUM",
                    "tokenType": "FUNGIBLE_COMMON",
                    "supplyType": "INFINITE",
                    "totalSupply": "50",
                    "maxSupply": "0"
                }
            }
        },
        "network": "testnet",
        "mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
    },
    "receipt": {
        "status": "SUCCESS",
        "accountId": "",
        "fileId": "",
        "contractId": "",
        "topicId": "",
        "tokenId": "",
        "scheduleId": "",
        "exchangeRate": {
            "hbars": 30000,
            "cents": 333977,
            "expirationTime": "Fri, 26 Apr 2024 20:00:00 GMT",
            "exchangeRateInCents": 11.132566666666667
        },
        "topicSequenceNumber": "0",
        "topicRunningHash": "",
        "totalSupply": "0",
        "scheduledTransactionId": "",
        "serials": [],
        "duplicates": [],
        "children": []
    }
}