# transfer()
```
payable(msg.sender).transfer(address(this).balance);
```
# send()
```
bool sendSuccess = payable(msg.sender).send(address(this).balance);
require(sendSuccess, "Send failed");
```
# call()
```
(bool callSuccess, ) = payable(msg.sender).call{value: address(this).balance}("");
require(callSuccess, "Send failed");
```