I know that Airbnb haven't opened their API to the public yet, but searching the internet I found some people are using it.
I tried to contact them, and also Airbnb, but without any answers.
Does anyone here knows any contact email, page, or phone number that I can refer to?
I have read here that you can find your API key by looking at the requests that AirBNB uses in their own website. So use the web-developer tools in chrome, or firefox, or firebug in firefox and search trough the requests in the network panel until you find the key being used in any JSON request. Some urls contain this key param, you copy that :) works for me!
Oh BTW, i'd like to remind you that the API is currently not officially released to fetch data in the background while you are logged in. When you use this key, they'll know your identity. You might get blocked or at least warned by AirBNB for using their API while you are maybe not allowed to. Read their terms & conditions to make sure. I am not taking any responsibility, of course ;)