For your convenience, SellFire offers code samples for accessing the Data API using both PHP and C#. If you have code in a different language that you would like to share, please send it in!
PHP
This example demonstrates how to make a request to the Data API using PHP.
C# / .NET
A light weight wrapper to access the Data API can be downloaded here. The wrapper requires that you use the JSON.Net API from Newtonsoft. For examples of calling the SellFireApi class, see the ExampleCalls file.