Announcement reposted from Amazon:
If your business automation uses a private app to pull data from Marketplace Web Service (MWS) API sections, you must migrate your private app to the Selling Partner API (SP-API) by April 1, 2024, to ensure business automation continuity.
Access to the following MWS API sections will be removed after that date:
- Fulfillment Inbound Shipment
- Fulfillment Inventory
- Fulfillment Outbound Shipment
- Push Notifications Schemas
Alternatively, you can choose to replace your private app with a third-party app from the Amazon Selling Partner Appstore
Note: Private app access to the Merchant Fulfillment, Orders, and Reports MWS API sections was removed in September.