I'm running into the same issue - Squarespace seemed to advertise that they can sync inventory but this doesn't seem to actually be the case. I've got an issue where my inventory is in Squarespace and I need to offer employees a way to use the POS app. There isn't a way in squarespace to give permission just to use the POS app (and I don't even know what admin permission I'd give them to do it) - and if they use the Square app instead it wont keep track of our inventory.
GRRRR!!!!
I hit the same issue and got no help from Squarespace as they seem to have a lack of understanding how much customisation a customer may require when they are designing their website. Kilograms are great if you are selling car tyres or garden furniture but if you sell craft, jewellery or any small item for that matter grams are the required measurement. All my goods are sold in grams and it looks so unprofessional that I have to display a product weight 20g as 0.02Kg. Even when I ship with Royal Mail, I enter grams as the parcel weight as I never ship anything over 2kg!
Squarespace reminds me of what software development was like in the 1990's where a developer would design what they thought was wanted and not what the end user actually required.
