XRP Ledger signing

{
  "blockchainKind": "XrpLedger",
  "kind": "Transaction",
  "transaction": "0x120000220000000024029a62a82e0001e240201b02a6243661400000000000000168400000000000000c8114860184b4f4c6cc17ae9c2a77cfcd328b43ec2aac8314543aba55a3bede29c5d512ff0cb17db626b9ed9a"
}

import { Client, encode } from 'xrpl'

const walletId = 'wa-6lbfv-9esgj-xxxxxxxxxxxxxxxx'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const client = new Client(RIPPLE_NODE_URL)
await client.connect()

const transaction = await client.autofill({
  TransactionType: 'Payment',
  Account: wallet.address,
  Destination: 'rBYtCQKxGTfFuob3hxSc8pEYddetT9CdDZ',
  Amount: '1',
})

const res = await dfnsClient.wallets.generateSignature({
  walletId,
  body: {
    kind: 'Transaction',
    transaction: `0x${encode(transaction).toLowerCase()}`,
  },
})