I am working on a Squarespace store for a winery and need add some features to the checkout page.
The customer's order cannot be processed unless it is a multiple of 12.
I've been checking out forums for documentation of similar things but I haven't found much involving Squarespace pages.
This website has a version of what I need (https://sage-hills-wine.myshopify.com/cart), however, I looked at their code and noticed that the "Order Limits" feature is integrated with Shopify, which I am not using.
Does anyone have experience with this involving merely some custom code inserted via Code Injection, or should I be looking into alternative e-commerce software for this level of customization?