Apple doesn’t let Amazon sell Kindle books via an app and it’s always a pain to have to open amazon.com in Safari and search to buy books.

Choose “Share” on any Kindle book in the Amazon app and run this Shortcut. It opens a web viewer for Amazon’s website which features a 1-click ordering button.

Preview

If you browse using the Kindle app, simply launch the shortcut by itself and it will bring up your Amazon browsing history. From there you’re two taps away from purchase.