Hi DIS,
There are a couple of ways for players to earn credits. You can enter any of our free weekly and monthly events for stroke play and closest to the hole. If you can crack the top 70 players then you will win a percentage of the purse. Alternatively if you look under the BUY CREDITS section you'll see an option to "Complete Offers for Credits". Have a look through those and you might be interested in taking advantage of some of our 3rd party offers.
Also keep in mind that as you progress through the tiers you will earn a small bonus for each promotion from Hack to Amateur, Amateur to Pro and Pro to Master.
Hope that helps and let us know if you have any more questions. =)