// Check if there is a referral in the URL and store it in a cookie
if (window.location.search.indexOf('ref=') !== -1) {
const urlParams = new URLSearchParams(window.location.search);
const referralID = urlParams.get('ref');
document.cookie = `referralID=${referralID}; path=/; max-age=31536000`; // store for 1 year
}