The LaunchKey .NET SDK offers an authentication system with several optional factors such as fingerprint verification, geofencing, and facial recognition. The current version is 1.2.2.0.
Mastercard recently announced the Mastercard Innovation Engine. The engine acts as a marketplace for next generation digital customer experiences. The marketplace allows Mastercard and collaborators to offer API access to customer-focused digital experiences through plug and play solutions.
Despite Instagram having fixed an API vulnerability, supposedly private photos are still vulnerable to unauthorized access thus proving how difficult API security can be.
Twitter has a popular iPhone app, but now some of its functionality is also built into Apple's latest mobile operating system, iOS 5. Tweeting a photo from the default camera app is now a tap away, as is tweeting a link from Mobile Safari. Tweeting is also built into the SDK, making it available via other applications without needing separate Twitter authentication.