Announcement reposted from Amazon:
On August 31, 2023, we’re discontinuing the Marketplace Web Service (MWS) Merchant Fulfilment, Orders and Reports API sections. After this date, MWS users won’t be able to retrieve data from these sections.
If you use any of these API sections, you must migrate from MWS to SP-API or replace your private app with a third-party app by August 31 to avoid disruption to your business automation.
Using SP-API will help you grow your business through increased selling efficiency, reduced labour requirements and improved response time to customers.
Effective April 1, 2024, all other remaining MWS API sections will be discontinued.
To find vetted, high-quality third-party apps to replace existing MWS integrations, go to Amazon Selling Partner Appstore .
For more information, go to SP-API Migration Hub .