Yes, you can integrate your squarespace site with foxy.io using square as a payment processor to sell CBD product. My site, stillycbd.com uses this solution.
There are some limitations using foxy.io
- You need to be somewhat tech savvy as there is a decent amount of java involved, although the documentation they provide is pretty good
- As paul2009 mentioned, there are transaction fees involved
- It's not built into Squarespace's checkout, so customers are taken to a third party checkout (foxycart)
If you'd like some more in depth instructions, feel free to reach out. Foxy team has also been really helpful with set up.