There are challenge games in matchplay, Skins, Blitz, and there are ready-go tournaments. Based on the data I see on your profile (average, clubs, experience) you may rather lose credits there than win.
Other modes of gaining credits include car-washing, dish-washing, lawn-mowing and other occupations. Don't worry that you get only quid there - get gift cards (subway etc) and transfer them into this beautiful game.
Happy hitting!