Your API key will be on this page:

https://leaderboardaffiliate.com/settings


You can only access this page if you own a re-seller license for any level for leaderboard affiliate, otherwise you will not be able to access this page.


To purchase a reseller license you first need to own a level in leaderboard affiliate, and then you'll see a popup appear on your screen that will prompt you to purchase a reseller license.