Our client had an extensive custom internal back office application written on the LAMP stack which needed to be integrated with Kashoo Simple Cloud Accounting. We built a wrapper library in PHP to interface with Kashoo’s REST API, and allow easy integration with their existing tool set.
The client graciously allowed us to release the library to the community as an open soruce project, on GitHub.
Command line output from Kashoo PHP API test script 
Kashoo PHP API class PHP code 
Kashoo PHP GitHub page