Jomres is unique among Joomla and Wordpress booking systems because it contains a complete, Oauth2 standard REST API which is built into the free Core.

Using Jomres API Feature plugins (all free with any license) Jomres provides 80+ endpoints for connecting remote services to your Jomres installation, and the manual contains enough information for you to build your own functionality if you should see a need that the current crop of plugins doesn't meet.

 Jomres is the only free online booking engine and PMS that offers this functionality at no extra cost!