How do I manually add Audiences add to cart tracking for BigCommerce?

1. Proceed to the BigCommerce dashboard, and click on Storefront in the sidebar
   
2. Click on Script Manager
   
3. Click on Create a script in the top right
4. Select these settings for the script.
   Script name: Instant Audiences Add to Cart
   Placement: Header
   Location: All pages
   Script category: Essential
   Script type: Script
5. Copy and paste the following code into the "Script contents" text box. 

<script>
    (function () {
        const originalOpen = XMLHttpRequest.prototype.open;
        XMLHttpRequest.prototype.open = function () {
            try {
                this._interceptedUrl = arguments[1].toString();
            } catch (err) {
                console.error("Error setting intercepted URL");
            }
            return originalOpen.apply(this, arguments);
        };

        const originalSend = XMLHttpRequest.prototype.send;
        XMLHttpRequest.prototype.send = function (body) {
            try {
                const urlToCheck = this._interceptedUrl;
                if (
                    urlToCheck &&
                    (urlToCheck.includes("remote/v1/cart/add") || urlToCheck.includes("remote/v1/cart/update"))
                ) {
                    window.InstantJS.track("ITEM_ADDED_TO_CART");
                }
            } catch (err) {
                console.error("Error adding event listener for handling interception");
            }
            return originalSend.apply(this, arguments);
        };
    })();
</script>