want to swap all the eth on my contract per busd... how to input that balance in swapExactETHForTokens{ value: msg.value }???

thanks

hi, how to know how many x tokens are on my smart contract??

How is that function? with uint amount = address(this).balance; I get only eth or bnb amount.

IERC20(token).balanceOf(address(this))

need to use interface IERC20

define IERC20 public token; then call the balanceOf the contract as shown above

using this IERC20(token).balanceOf(address(this)) should i provide token address on "token"?

should i use IERC20 from openzeppelin, right?

yes

interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}

fine

might not need it all, depends what you are trying to do

have you even used this fucntion ? swapExactTokensForETH

yes