You can now install the official Smootify Webflow App directly from your Webflow designer and use the Webflow Components without moving out of your project.
Just go to this page and click on the install now button.
Once done, you only need to follow this doc to connect your project to Shopify.
From the Smootify news archive. Some of it describes Smootify 1.x; see the changelog for what changed since.