The code is below, but the tx is empty after sendTransfer.

import { WalletContractV4, beginCell, internal, TonClient4, toNano, Address } from 'ton';

const packed_msg = beginCell().store(
storeMsg({
$$type: MSG_TYPE,
}),
)
.endCell();
const tx = await contract.sendTransfer({
seqno,
secretKey,
messages: [
internal({
to: this.contractAddress,
value: gasFee: toNano('0.02'),
body: packed_msg,
}),
],
});

I said sendTransfer code and valid one. this is not valid.

// create client
const client = new TonClient({
endpoint: 'https://toncenter.com/api/v2/jsonRPC',
apiKey: 'YOUR_API_KEY'
});

// get sender
let workchain = 0;
let keyPair = await mnemonicToPrivateKey(mnemonics.split(" "));
let secretKey = keyPair.secretKey;
let wallet_contract = WalletContractV4.create({ workchain, publicKey: keyPair.publicKey });
let my_wallet = client.open(wallet_contract);
let seqno: number = await my_wallet.getSeqno();

// send and get TX
// your code from prv msg
const packed_msg = beginCell().store(
storeMsg({
$$type: MSG_TYPE,
}),
)
.endCell();
await my_wallet.sendTransfer({
seqno,
secretKey,
messages: [
internal({
to: this.contractAddress,
value: gasFee: toNano('0.02'),
body: packed_msg,
}),
],
});

// get transactions from API
let transactions = await client.getTransactions(my_wallet.address);
console.log(transactions);

you can use blueprint to run your scripts with built-in providers or if it's a web app you should use tonconnect sdk

I use the getTransactions before, but can’t find the field of txId, and how to make sure the latest transaction is the one we are looking for if it’s a tx list.

I figured out how to solve it. Thanks