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Transaction

Signs an unsigned transaction and broadcasts it to chain.
FieldDescriptionType - Optional
kindTransactionString
transactionThe unsigned hex encoded transaction as shown below.String
externalIdA unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).String (optional)
{
  "kind": "Transaction",
  "transaction": "0x00000200080100000000000000002044732583a657f2d13bce82acc611e5ea6424508036f27e3a3277f24f55f9bfc60202000101000001010300000000010100b8737aab95b5d62407a921c23d26f28cd94da2df511276693a5cba782ae640ee01122efbd2244535c134ab802ad247b3ece73641e7ea8169b199bb6fa644af3ef32ffa94070000000020608d3f1e7023d0947f8274db06898744fadb3598769f8463070536ce489ca336b8737aab95b5d62407a921c23d26f28cd94da2df511276693a5cba782ae640eee803000000000000e06f3c000000000000"
}

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Typescript Example with IOTA SDK

First install the IOTA SDK. You can find the full documentation here Here a code sample to broadcast a transaction via the Dfns TypeScript SDK: 
import { IotaClient } from '@iota/iota-sdk/client'
import { Transaction } from '@iota/iota-sdk/transactions'

const walletId = 'wa-4to1j-8tho9-xxxxxxxxxxxxxxxx'
const wallet = await dfnsClient.wallets.getWallet({ walletId })

const client = new IotaClient({ url: process.env.IOTA_RPC_URL! })

const transaction = new Transaction()
const [coin] = transaction.splitCoins(transaction.gas, [1])
transaction.transferObjects([coin], '0xb8737aab95b5d62407a921c23d26f28cd94da2df511276693a5cba782ae640ee')
transaction.setSender(wallet.address!)
const bytes = await transaction.build({ client })

const res = await dfnsClient.wallets.broadcastTransaction({
  walletId,
  body: {
    kind: 'Transaction',
    transaction: `0x${Buffer.from(bytes).toString('hex')}`,
  },
})
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