I want to make a timer start counting down right after receiving a javascript response

function startTimer(duration, display) {
var timer = duration, minutes, seconds;
setInterval(function () {
minutes = parseInt(timer / 60, 10);
seconds = parseInt(timer % 60, 10);

minutes = minutes < 10 ? “0” + minutes : minutes;
seconds = seconds < 10 ? “0” + seconds : seconds;

display.textContent = minutes + “:” + seconds;

if (–timer < 0) {
timer = duration;
}
}, 1000);
}

window.onload = function () {
var fourMinutes = 60 * 4,
display = document.querySelector(‘#time’);
startTimer(fourMinutes, display);
};

<section>
<h6>Timer</h6><div><span id=”time”>04:00</span></div>
</section>

async function getQuote() {
if (
!currentTrade.from ||
!currentTrade.to ||
!document.getElementById(“from”).value
)
return;

let amount = Number(
document.getElementById(“from”).value *
10 ** currentTrade.from.decimals
);

const quote = await Plug.quote({
network: “repl”,
fromAddress: currentTrade.from.address,
toAddress: currentTrade.to.address,
amount: amount,
});
console.log(quote);
document.getElementById(“to”).value =
quote.toAmount / 10 ** quote.to.decimals;
}