How to limit to one item and one quantity only per checkout?

Shopify Discussion
3

You can use this app, which is very affordable. I have been using for a bit and the customer service is excellent. https://magecomp.com/shopify-limit-qty-purchase.html It remembers customers and purchase history. It is pretty easy to set up. It goes by product name. It is really great for digital products. You can also set this to where it is limit 1 or however many per checkout. Very customizable.