Notification API Version 1.3.0

This release adds two notification topics: ITEM_AVAILABILITY and ITEM_PRICE_REVISION. These topics are currently available only for fixed-price items on the eBay UK marketplace.

ITEM_AVAILABILITY: Developers who are subscribed to this topic receive a push notification when an item's availability type changes. Availability types include Available, Unavailable, and Temporarily Unavailable.

ITEM_PRICE_REVISION: Developers who are subscribed to this topic receive a push notification when an item's price changes.