Check out The zeus integration maybe? It might only be with their pos so that's more for brick and mortar but idk if they've got other integrations?
With Square dragging their feet on support for bitcoin payments, I'm excited to begin tinkering with Plebian Market; I've created a storefront and added a couple of items to ease into the platform. To support this Nostr + Bitcoin powered solution, I'll be steering 3% of sales to help support their contributors. Here's a listing for the milled aluminum signers I also offer in my Square store.
https://plebeian.market/product/f8b2e731-85c8-4f67-b403-241d53f8f90c
Discussion
Just looked into it and it's only for their payment terminals, not a solution for online sales.
Ahh too bad...
Maybe this is more what you're looking for...?
Shopify has easy setup with open node or strike