# Cart Verification Script

Appointments in the cart can become unavailable if someone else books the same slot first.

The **Cart Verification Script** checks availability and prevents double bookings by validating that the selected slot is still available.

{% hint style="info" %}
What customers see

A small storefront notification appears (bottom-left) when Sesami validates the booking.
{% endhint %}

## Enable / manage it

{% tabs %}
{% tab title="Online Store 2.0 themes" %}
This setting may be available as a storefront setting / theme integration option depending on your theme setup.
{% endtab %}

{% tab title="Vintage themes" %}
Go to:

**Sesami → Settings → Validate appointments in cart**

Then enable the checkbox.
{% endtab %}
{% endtabs %}

## Styling

You can customize the style (colors, fonts, etc.).\
See: “How to customize the styles of the Cart Verification Script”.


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