What to Do When __cow-internal-id Appears in Your Shopify Cart

Seeing __cow-internal-id in Your Cart? Here's How to Fix It

If you notice __cow-internal-id or a similar code appearing in your cart, this can be resolved quickly. This is a private cart attribute used by Cowlendar to connect bookings with specific products during checkout. These attributes are meant to stay hidden from customers, but they may appear if your Shopify theme is outdated.

Why This Happens

Some older or custom Shopify themes don’t automatically hide private cart attributes that start with double underscores (like __cow-internal-id). As a result, internal booking data may be displayed in the cart interface.

How to Fix It

To remove this from your cart and keep the checkout process clean:

1. Go to your Shopify admin and select Online Store > Themes

2. Find the theme you’re currently using

3. Click Actions > Update if an update is available

4. Check your cart again to confirm that the attribute is no longer visible

If no update is available or you're using a custom theme, we recommend contacting your theme developer or Shopify Support for further assistance.