The current application id that I am using is dohH3hjIkY6Pq1YM3Ltifl5Wg.yqePzIqw_rtQ--
That looks like your consumer/api key. Your app id is a much shorter string, and you should find it on the info page for your application from the My Projects page. I'm using OAuth instead of BBAuth, but I would think the app id would be in the same place.
The source they're looking for is the string "APP.[appid]". You can see an example on this page for the Updates API:
http://developer.yahoo.com/social/rest_api...e-resource.html Funny enough, I just skimmed through the pages and the Contacts API Documentation doesn't seem to show that it requires the app id for getting contacts. Maybe this is a problem with the documentation and it does expect it?