The Xena platform gives you an API along with language-specific examples, and documentation to help you develop apps that integrate with Xena.
The core functionality of Xena apps is to enhance the Xena application by allowing developers to implment custom fetures not avaliable in the standard implmentation of Xena. This page describes some of that functionality and points you to resources to assist you in building it into your app.
Using the Xena api you can create a new partner for use with X
Using the xena api you can create a new order and submit standared data for your business case.
Using the xena api you can add invoices to the system though your application.