# withdrawERC20

Withdraw ERC-20 tokens from one user and returns a `Voucher` to the recipient on L1.
The voucher still need to be created through a [createVoucher](../create-voucher) call.

## Usage

The following example withdraws the entire CTSI balance of the user who is submitting an input to the application.

```ts twoslash
import { createApp } from "@deroll/app";
import { createWallet } from "@deroll/wallet";

// create app
const app = createApp();

// create wallet
const wallet = createWallet();

app.addAdvanceHandler(wallet.handler);

const token = "0x491604c0FDF08347Dd1fa4Ee062a822A5DD06B5D"; // CTSI address
app.addAdvanceHandler(async ({ metadata }) => {
    const user = metadata.msgSender;
    const value = wallet.erc20BalanceOf(token, user);
    if (value > 0) {
        const voucher = wallet.withdrawERC20(token, user, value); // [!code focus]
        await app.createVoucher(voucher);
    }
    return "accept";
});
```

## Returns

Type: `Voucher`

## Parameters

Type: `Address`

Address of ERC-20 token.

Type: `string`

User to withdraw from.

Type: `bigint`

Amount to withdraw.