If you upgraded in App Store, Google Play Store or on Golf Pad website, there is no license code needed. Your account is upgraded automatically once the purchase is completed. You can see your upgrade status under Golf Pad preferences / License. If you purchased Premium but it did not show automatically, please wait 15 minutes then tap refresh icon in Golf Pad preferences. And if you get a new phone, your upgrade will transfer as long as you log in with the same account, no license code is needed. Learn more about ways to upgrade: How do I upgrade to Golf Pad Premium? 

If you purchased a set of Golf Pad TAGS or a Golf Pad Premium gift voucher, you will receive a license code. In this case you need to enter it as described here: How do I enter a license code?