    if (!_response.success) {return true;}
    // Check for an invalid roundId that is 0
    if (_response.roundId == 0) {return true;}
    // Check for an invalid timeStamp that is 0, or in the future
    if (_response.timestamp == 0 || _response.timestamp > block.timestamp) {return true;}
    // Check for non-positive price
    if (_response.answer <= 0) {return true;}
(uint80 roundID, int256 price, , uint256 timeStamp, uint80 answeredInRound) = ETH_CHAINLINK.latestRoundData();
require(price > 0, "Chainlink price <= 0"); 
require(answeredInRound >= roundID, "...");
require(timeStamp != 0, "...");
