I wrote this post a while back and am just getting around to sharing it. A lot has changed in the short time since I wrote this. For Particle itself it seems to be obsolete, but it should help if you just want to try webhooks with another IoT product. If you give it a read, let me know what you think!
https://medium.com/@dillon1337/particle-losant-integration-using-webhooks-eb2aaafb1782#.gl5hylomq