When you're setting up a country club, if you set an entry fee and set the prize as credits/trophy + credits, the winner will get credits. WGT take 20% of the credits from the entry fee and put the rest into the prize pool. Also, you can set the amount of people who win credits to either winner takes all, top 3 (55%, 30%, 15%) or top 10 (40%, 20%, 10%, 9%, 6%, 5%, 4%, 3%, 2%, 1%).
I hope this helps!