How do I import Kindle highlights from an international Amazon domain?

The Readwise extension is designed to work with Kindle highlights synced to the cloud at read.amazon.com/notebook. Sometimes, international Kindle users will find their highlights stored on a domain other than the read.amazon.com. Many of these international domains will work fine with the Readwise extension as-is. Some will fail (such amazon.co.jp).
It's on our roadmap to add more robust international support, but in the meantime, there are two workarounds if you hit a snag.
  1. If you have an iPhone or iPad, many of the international Amazon domains have been synchronizing using our iOS mobile app, downloadable here: Readwise iOS App.
  2. If you read on a Kindle device, you can upload to Readwise a file called My Clippings.txt stored on your Kindle. Instructions are here: My Clippings.