Sign MultiAgent Transaction

`signMultiAgentTransaction()`

If you are logged in to Face Wallet, users can sign multi-agent transactions. When signing a transaction, users would review the transaction information and enter the PIN code through Face Wallet modal.

You should submit signed transaction data to APTOS node to execute the transaction.

import { Face, Network } from '@haechi-labs/face-sdk';
import { AptosClient, TxnBuilderTypes } from 'aptos';

const face = new Face({
  network: Network.APTOS_TESTNET, 
  apiKey: 'YOUR_DAPP_API_KEY'
});
const aptosProvider = face.aptos.getProvider();

const aptosClient = new AptosClient('APTOS_NODE_URL');

// Dapp should choose the input required to send transaction
const userWalletAddress = (await aptosProvider.getAddresses())[0];
const userWalletPublicKey = (await aptosProvider.getPublicKeys())[0];
const feePayerAddress = "FEE_PAYER_ADDRESS";
const receiverAddress = "RECEIVER_ADDRESS";

const payerAccountData = await aptosClient.getAccount(feePayerAddress);
const sequenceNumber = parseInt(feePayerAddress.sequence_number);

 const rawTransaction = await aptosClient.generateTransaction(
    feePayerAddress,
    {
      arguments: [
        receiverAddress,
        createPlatformCoin(amount, networkToBlockchain(network)).toDecimalAmountAsString(),
      ],
      function:
        '{Address}::{Module}::{Function}',
      type_arguments: [],
    },
    {
      sequence_number: sequenceNumber.toString(),
    }
  );

const multiAgentRawTx = new TxnBuilderTypes.MultiAgentRawTransaction(rawTransaction, [
    TxnBuilderTypes.AccountAddress.fromHex(userWalletAddress),
 ]);

const signature = await aptosProvider.signMultiAgentTransaction(multiAgentRawTx);
const payerSignature = 'signed transaction signature with feePayer';

const payerAuthenticator = new TxnBuilderTypes.AccountAuthenticatorEd25519(
    new TxnBuilderTypes.Ed25519PublicKey(payerAccount.pubKey().toUint8Array()),
    new TxnBuilderTypes.Ed25519Signature(payerSignature.toUint8Array())
);

const senderAuthenticator = new TxnBuilderTypes.AccountAuthenticatorEd25519(
    new TxnBuilderTypes.Ed25519PublicKey(userWalletPublicKey.toUint8Array()),
    new TxnBuilderTypes.Ed25519Signature(HexString.ensure(signature).toUint8Array())
);

const multiAgentAuthenticator = new TxnBuilderTypes.TransactionAuthenticatorMultiAgent(
    payerAuthenticator,
    [TxnBuilderTypes.AccountAddress.fromHex(senderAddress)],
    [senderAuthenticator]
);

const signedTx = new TxnBuilderTypes.SignedTransaction(
    multiAgentRawTx.raw_txn,
    multiAgentAuthenticator
);

const pendingTransaction = await aptosClient.submitTransaction(BCS.bcsToBytes(signedTx));
await aptosClient.waitForTransaction(pendingTransaction.hash);