Discussion: Auth Redirect URI

Hello,

I am curious about creating a new key for a project that I'm working on.  I mainly only need it to allow a visitor to login, then using their info, check to see whether or not they are a friend of mine (or another players), and then record their username/ some form of ID and use that to send an email to my domain email account.  In this case, it will be for a player to contact me, but making sure they are a player and are in my friends list.  Not sure what use this will be for my project yet, but its something I'm thinking I might do.  

Anyways, regarding the Auth Redirect URI part of the create API key page, what should go there?  If I put a URI there and that changes later, can i edit the key request to reflect the change in URI or do I need to reapply for a new key?  At this point I'm working on developing my website tool, and the host I have will most likely change once the site is finished.

Thanks for you help!
There is an auth guide by Bees! here:  http://www.iamcal.com/misc/glitch/

Your app's API key is given to you and won't change; the URI is a page on your own site that completes the auth process. If you need to make changes to the redirect URI, you can update the URI on your app's settings page. There's no need to reapply for a new key as all of the info for your app can be edited any time.
thanks!