OAuth is a standard way of a user allowing access to some of their data from one website to another.
When you use "Login with Battle.net" it's the same technology that powers "Login with Facebook" or "Login with Twitter" buttons that you may have seen in other places on the internet. Our websites sends you to Battle.net where you would log in as normal (including using your authenticator). When you type in your username and password, notice that you are on Battle.net websites and it's secure (via the lock icon in your brower's address bar). You are logging in with your credentials to Battle.net, not our site.
What happens afterword is rather technical, but basicaly you are shown a screen where you grant our site access to see your list of wow characters. The data about your wow characters is the same public data that appears on your armory page. So by logging in with battle.net, our site gets this information about you:
- Your Battle.net account ID
- Your Battle.net battle tag
- If you give us permission: