Sending ERC-20 Tokens

You can ask the wallet to send a single ERC-20 token transfer:

const erc20Interface = new ethers.Interface([
  'function transfer(address _to, uint256 _value)'
])
 
// Encode an ERC-20 token transfer to recipient of the specified amount
const data = erc20Interface.encodeFunctionData(
  'transfer', [recipientAddress, amount]
)
 
const transaction = {
  to: daiContractAddress,
  data
}
 
const signer = wallet.getSigner()
const txnResponse = await signer.sendTransaction(transaction)
console.log(txnResponse)

With batching functionality, you can send multiple token transfers in a single native transaction:

const erc20Interface = new ethers.Interface([
  'function transfer(address _to, uint256 _value)'
])
 
// Encode two different ERC-20 token transfers
const data1 = erc20Interface.encodeFunctionData(
  'transfer', [recipient1Address, amount1]
)
const data2 = erc20Interface.encodeFunctionData(
  'transfer', [recipient2Address, amount2]
)
 
const transaction1 = {
  to: daiContractAddress,
  data: data1
}
 
const transaction2 = {
  to: daiContractAddress,
  data: data2
}
 
// Send a multiple transactions as a single bundle which is executed as one transaction on-chain.
const signer = wallet.getSigner()
const txnResponse = await signer.sendTransaction([transaction1, transaction2])
console.log(txnResponse)