How to set contract transfer fee?

[Unintendedz]

Hi, everyone. For now, I'm doing this.

import { ethers } from 'ethers'
import { BscscanProvider } from "@ethers-ancillary/bsc"

const abi: ethers.ContractInterface = [{
        "inputs": [
            {
                "internalType": "address",
                "name": "recipient",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amount",
                "type": "uint256"
            }
        ],
        "name": "transfer",
        "outputs": [
            {
                "internalType": "bool",
                "name": "",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },]
    
 
    const myWallet = new ethers.Wallet(
        SENDERS_PRIVATE_KEY, 
        new BscscanProvider("bsc-mainnet")
    )
    console.log(myWallet);

    const contract = new ethers.Contract(CONTRACT_ADDRESS, abi, myWallet)
    const amount = ethers.utils.parseUnits("1")

    const transferResult = await contract.transfer(RECIPIENTS_ADDRESS, amount)
    console.log("transferResult:", transferResult);

It's working perfectly, but I have no idea how to set the transfer fee like Metamask.

Any help is appreciated!

[Unintendedz]

After some research I found solution

    const abi= new ethers.utils.Interface([
        'function transfer(address recipient, uint256 amount)',
        'function balanceOf(address owner) view returns (uint)'
    ]);
 

    const contractAddress = 'CONTRACT_ADDRESS';
    const provider = new BscscanProvider("bsc-mainnet")
    const myWallet = new ethers.Wallet(
        'PRIVATE_KEY',
        provider
    )
    const contract = new ethers.Contract(contractAddress , abi, provider);
    const balance = await contract.balanceOf(myWallet.address) 

    const tx = await contract.populateTransaction.transfer(
        RECIPIENTS_ADDRESS,
        balance
    )

    tx.gasPrice = ethers.utils.parseUnits("5", "gwei")
    tx.gasLimit = BigNumber.from("21000")
    tx.chainId = 56
    tx.nonce = await provider.getTransactionCount(myWallet.address);
    console.log(tx);

    const signedTx = await myWallet.signTransaction(tx)

    const result = await provider.sendTransaction(signedTx)
    console.log("result:", result);