In order to support effortless resale, you need effortless integration with your store. Last week we released v2.0 of our React Widget for headless stores or stores that use React sparingly. We also released the v1.0 of our Shopify Customer UI extension for stores that support new customer accounts, and Shopify Theme UI extension for stores using legacy customer accounts.
React Widget 2.0
The new React Widget has an updated design, and is now opinionated about how it looks — but still has some styling flexibility baked in so that it aligns with your site design and brand aesthetic. We've also simplified the implementation, removing all of the old render props and only showing
Resell with Authentified
or Resold with Authentified
— depending on whether or not the item has been sold or not.
Shopify Customer UI extension
If you're lucky enough to be using new customer accounts, you can use this extension to support effortless resale for your customers. The button can be placed on the order index page.

or the order detail page

Shopify Theme UI extension
This version is perfect for stores that use a Liquid theme and are still using legacy customer accounts.