Sent by eBay to request that you update information about an eBay member in your subscription database. This call always applies to an existing subscription.
eBay sends an updateSubscriber call to your application when eBay detects a change in a subscription state for a user. For example, if an SM Apps developer changes a user's subscription state using the Embedded Applications tab (at the Developers Program website), eBay sends an updateSubscriber call to your application.