The Filestack Objective-C Sample Code by Filestack presents how to access the API to integrate configurable and transformable file upload features. Xcode project available demonstrates basic JSON protocols to perform callbacks against the API.
Box has introduced the Box File Collaboration API, a new API that allows developers to manage access to files in applications. Developers can now control which users can access specific files. The API was created to support a recent update to the Box Notes collaborative note taking application.
Dropbox last week announced that it has added webhooks functionality so that application developers can configure Dropbox to notify their apps whenever their app's registered users perform an action that results in a file change.
Late last week Google announced the release of version 3.0 of their Google Documents List Data API. This latest release addresses several feature requests filed by developers and also aims to improve speed and stability of the API itself (our Documents List Data API Profile). The most notable detail in this release is the ability to upload and download files in PDF.