This is EXACTLY the kind of mistake I'm talking about. That service is not providing anything you can't easily do with a bitcoind. And it's opening you up to a HUGE security hole. Don't know that that hole is? Then that is exactly why you should not be using third party solutions.  At least one security hole on this site is easy to identify, but that is not true of most 3rd party sites.  You'll never know all the security liabilities.  With bitcoind you know what you're getting into, and it just isn't that much harder to do a json request then to get a post notification from a 3rd party site.

Tell me why are you trying to avoid using the proper API?  You just don't want to read the manual? Reading the manual and learning how bitcoin works is a small price to pay for the security and reliability it can offer if used properly.