Automatically add a discount code cookie to a Shopify customer's basket when they land on the page. Useful if you need to apply a discount, but can't use automatic discounts. A bit like using the link Shopify provide, but without the need for the link. Also; will check for existing discount cookie before applying.

auto-apply-shopify-discount.js

(function() {
  const discountValue = 'DISCOUNTCODEHERE';
  const daysToExpire = 7;
  let discountCode;

  if (document.cookie.includes("discount_code=")) {
    discountCode = document.cookie.split('; ').find(row => row.startsWith('discount_code=')).split('=')[1];
    console.log("Discount code is: " + discountCode);
  } else {
    const date = new Date();
    date.setTime(date.getTime() + (daysToExpire * 24 * 60 * 60 * 1000));
    document.cookie = `discount_code=${discountValue}; expires=${date.toUTCString()}; path=/`;
  }
})();