#1 - May 14, 2013, 12:51 p.m.
Here are some helpful links to get you started.
API Introduction - http://us.battle.net/wow/en/forum/topic/2369881371
API Documentation - http://blizzard.github.com/api-wow-docs/
See Also
- A brief list of known issues and caveats - http://us.battle.net/wow/en/forum/topic/2743700663