Now I've made it in time yet and from now on you have the module "API interface" as an extension but still in the BETA phase available. Currently, the API includes only the most necessary functions, such. Add and remove TSI users, and a few more, but of course it will be regularly extended and optimized from now on. A documentation of the current functions can be found here or in the upper navigation bar under the menu item "API". Regarding the use follows shortly also a short instruction with examples. If you encounter any errors, I would be grateful if you report them via bugtracker or forum.