I have done some hunting around the last couple of days, could someone corrected me if I am wrong but it seems like that adding shopify or many ecommerce solutions onto another platform other the the ecommerce platform you need paste an embed code in if you want a custom look and feel?
A client would like me to replicate this site http://www.66thelabel.com/straw/, this link brings you to the shopping section. In order to purchase a product you need to click on to the product which takes you to the actual product where you can go on to add it to the cart. It seems to use the shopify buy button only?
Any new products which are then added I assume even on squarespace, the site holder would need to embed the buy now button? would this also be the same if this was a worpress site?