Look at the leaderboards from your score history. They are updated with the payouts when they have been checked by WGT.
Each tournament contains the announcement "top 70 players earn WGT credits".
In week 17 (weeklies) it says for you,
0.04 $ from a 71 score at the 9 hole Cabo (Full 18)
0.38 $ from 38 + 37 scores at the free Multiround
0.01 $ from a 39 at Oakmont (B9)
By experience I can tell that you should find the amounts of 4, 38 and 1 credits in your "account" tab above the PLAY NOW button in the left. If not, contact CS.
The latter tourney displays in the Amateur section, "CREDITS PURSE - 300 Credits"
@Shoe, @Typhoon: How comes these "no monetary value" credits are displayed as $$?