What is the best gem to connect for e-commerce in Rails?

Question

Ruby on Rails

I need a gem that will build the framework of the store (Adding goods to the site, adding to the cart, paying for the goods). I found this e-commerce , but I don’t know how to use it, how you can’t connect the gem, but I don’t want to build a project based on it, since the part of the project that doesn’t concern the store has already been done. Can you please tell me what are the gems for this? or how to connect e-commerce correctly? maybe I don't understand something..

Answer 1

Shopify?