Set Shopify Discount Code for Auto Apply

shopify_discount_cookie.js

function setCookie(name, value, days = 7) {
  let expires = "";
  let date = new Date();
  date.setTime(date.getTime() + (days*24*60*60*1000));
  expires = "; expires=" + date.toUTCString();
  document.cookie = name + "=" + (value || "")  + expires + "; path=/";
}

function setDiscountCookie(value) {
    setCookie("discount_code", value, 1);
}