Wholesale and retail sales?

I have a client that sells gourmet cheese, and sells in all three of these ways:

• via square for when she sells at her farmers market booth
• retail online ecommerce (using squarespace)
• wholesale purchases by restaurants where customers pay with a check after they receive an invoice

Right now, she manually updates her squarespace inventory after farmer's market and wholesale orders, but this is IMO a ticking time bomb and sooner or later, she's gonna sell the same inventory twice.

It seems like I can set her up with the Squarespace POS + the Square reader for the farmer's market.

What about for when she sells in bulk to restaurants? Does Squarespace (or some 3rd party integration) support sending invoices and adjusting inventory?

Hey, Did you manage to find an answer to this?  I would be interested in knowing a workaround for this as well.