Thanks to a forum suggestion, I'm also using Blue Stacks android emulator for PC get free credits. Try at your own risk but it works for me, after you set up the WGT app, I have my 2nd computer and if I'm playing golf or web surfing, watching TV, talking etc. you can click on the offers without much effort at all.
There's a youtube video if you want to see it in action.
Using Blue Stacks on your PC for free WGT Golf credits.
Or if you have the proper phone capabilities you can do it from your cell phone.