eBay Notification API is a service offered by eBay that allows users to receive real-time updates and notifications about their eBay account and transactions. This API allows users to set up alerts for important events such as items being sold, bids being placed, payments being made, and shipments being sent. Users can customize the types of alerts they receive and how they are delivered, such as through email, text message, or in-app notifications. By using the eBay Notification API, users can stay informed and up-to-date on their eBay activity, helping them to manage their account more effectively and efficiently.