Basically Amazon is depreciating their old MWS system. We are aware of these changes on Amazon and ready for them. All the necessary changes will be done from our side, so you don't need to do anything.
This is a part of Amazon letter that has some technical details:
For more information, refer to:
* 2014 Announcement: https://tiny.amazon.com/9xoi7qlg/2014Announcement
* Amazon MWS FAQ: https://developer.amazonservices.co.uk/…/155-4126279-6363533
* MWS Developer Permissions: http://tinyurl.com/mv864ua (login required)
* New orders version: http://tinyurl.com/mrvlheb
Just received an email from Linnworks about Upcoming Amazon API Changes
Does anyone have a link/email from Amazon themselves outling what the changes are in more technical detail?