Validating appointments in the cart
Appointments in the cart might become unavailable while a customer is still browsing, enabling this option will make the Sesami app check if the selected time slot is still available and prevent a double booking from taking place.
This is how it looks on your store, on the bottom left of the storefront, like a notification:
How to enable or manage it?
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Shopify Vintage Themes:
By clicking the checkbox under the setting:
Sesami > Settings > Validate appointments in cart -
Shopify OS 2.0 Themes:
Can I customize the style of the Cart Verification Script alert? Changing colors, font...? YES!
Please check this article for more details: How to customize the styles of the Cart Verification Script