The CallFire API sample code included in this repository is licensed under the Apache License, Version 2.0.
You can find langauage-specific sample code in each of the language-specific directories. At the time of this writing, the Java samples are the most developed. PHP and CSharp examples are coming soon.
It is possible to register for notifications; however, all of the samples currently use a simple polling mechanism to check for status. Please go to http://callfire.com/help to request help using a postback notification mechanism.