How to install the FogBugz API

FogBugz version 5.0 has a simple API, which does not ship with Licensed FogBugz. You have to install it separately.  It's included in FogBugz On Demand.

To install the FogBugz API, download FogBugzAPI-Win.ZIP (for Windows) or FogBugzAPI-PHP.ZIP (for Unix/Mac). Extract the two files. Put them in the FogBugz\website directory on your server.

Developers may be interested in reading the online documentation of the API.

Earlier versions of FogBugz (1-4) do not have an API.  FogBugz 6.0 has the API built-in.