Obviously, security is always an important factor for both your game and the users playing your game.
What does this actually mean though?
What are the options?
When entering your white listed domains you have the choice of either entering each domain separately, or you can add a wild card domain which will then work on any sub-domains you use.
For example, if we were to add the two domain www.miniclip.com and docs.miniclip.com then we would only be able to make calls from these domains.
However, if we instead put one domain entry for miniclip.com this will work for any sub-domain under the Miniclip domain. In essence this equates to *.miniclip.com.