Once you have finished your game session, go to the "EXTRAS" section of your account.
You will be able to collect your winnings, which will be added directly to your account:
To check that your winnings have been received, go to the "HISTORY" section:
And click on "BOOSTS":
Your history will then be displayed with the amounts received when you took part in your missions:
The same applies to the Money Maker mission between 4pm and midnight, except that you need to go to the "MONEY MAKER" tab.