> For the complete documentation index, see [llms.txt](https://docs.mav.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mav.xyz/technical-reference/maverick-v2/v2-contracts/maverick-v2-supplemental-contracts/paymentbase/payment.md).

# Payment

**Inherits:** [State](/technical-reference/maverick-v2/v2-contracts/maverick-v2-supplemental-contracts/paymentbase/state.md), [PayableMulticall](/technical-reference/maverick-v2/v2-contracts/maverick-v2-common-contracts/base/payablemulticall.md), [SelfPermit](/technical-reference/maverick-v2/v2-contracts/maverick-v2-supplemental-contracts/paymentbase/selfpermit.md), [IPayment](/technical-reference/maverick-v2/v2-contracts/maverick-v2-supplemental-contracts/paymentbase/ipayment.md)

Payment helper function that lets user sweep ERC20 tokens off the router and liquidity manager. Also provides mechanism to wrap and unwrap ETH/WETH so that it can be used in the Maverick pools.

### Functions <a href="#functions" id="functions"></a>

#### receive <a href="#receive" id="receive"></a>

```solidity
receive() external payable;
```

#### unwrapWETH9 <a href="#unwrapweth9" id="unwrapweth9"></a>

Unwrap WETH9 tokens into ETH and send that balance to recipient. If less than amountMinimum WETH is avialble, then revert.

```solidity
function unwrapWETH9(uint256 amountMinimum, address recipient) public payable;
```

#### sweepToken <a href="#sweeptoken" id="sweeptoken"></a>

Sweep entire ERC20 token balance on this contract to recipient. If less than amountMinimum balance is avialble, then revert.

```solidity
function sweepToken(IERC20 token, uint256 amountMinimum, address recipient) public payable;
```

#### sweepTokenAmount <a href="#sweeptokenamount" id="sweeptokenamount"></a>

Transfers specified token amount to recipient

```solidity
function sweepTokenAmount(IERC20 token, uint256 amount, address recipient) public payable;
```

#### unwrapAndSweep <a href="#unwrapandsweep" id="unwrapandsweep"></a>

For tokenA and tokenB, sweep all of the non-WETH tokens to msg.sender. Any WETH balance is unwrapped to ETH and then all the ETH on this contract is sent to msg.sender.

```solidity
function unwrapAndSweep(IERC20 tokenA, IERC20 tokenB, uint256 tokenAAmountMin, uint256 tokenBAmountMin)
    public
    payable;
```

#### refundETH <a href="#refundeth" id="refundeth"></a>

Send any ETH on this contract to msg.sender.

```solidity
function refundETH() public payable;
```

#### pay <a href="#pay" id="pay"></a>

Internal function to pay tokens or eth.

```solidity
function pay(IERC20 token, address payer, address recipient, uint256 value) internal;
```

**Parameters**

| Name        | Type      | Description               |
| ----------- | --------- | ------------------------- |
| `token`     | `IERC20`  | ERC20 token to pay.       |
| `payer`     | `address` | Address of the payer.     |
| `recipient` | `address` | Address of the recipient. |
| `value`     | `uint256` | Amount of tokens to pay.  |

<br>