how to implement payment for smart contract functions not in eth but in any erc20 token

Question

I want to write a Smart contract where for a call to a specific function, for example, erc20Pay, not ETH will be accepted, but a regular erc20 token with a specific contract address. how can this be implemented on solidity

Answer 1

Smart Contracts depend on the specific ideals of the governance from burn to non burn tokens to DAO governance.

  function transferFrom(address sender, address recipient, uint256 amount) 
external returns (bool);
function balanceOf(address account) external view returns (uint256);


constructor(address _tokenAddress, uint _price) {
    tokenAddress = _tokenAddress;
    price = _price;
}

function buy() public {
    IERC20 token = IERC20(tokenAddress);
    uint tokensNeeded = price * 1 ether;
    require(token.balanceOf(msg.sender) >= tokensNeeded, "Insufficient funds");
    require(token.transferFrom(msg.sender, address(this), tokensNeeded), "Token 
  transfer failed");
    // execute function
}
 }