A: Here are answers to your questions:

Carts with Upsells:
You can currently create carts, but upsells are not supported natively yet.

Custom Domains:
Yes, you can connect your website to a custom domain.

Domain Cost per Year:
Vzy doesn’t sell domains directly. You’ll need to purchase one from a registrar like Namecheap, GoDaddy, or Google Domains.