Once you have completed your mission, you can retrieve your benefits by clicking on the MISSION button in your PROFILE.
You will see that your mission is completed, and all you have to do is click on the "CLAIM" button present:
A message will appear inviting you to go to the ‘EXTRAS’ section of your account if it is a boost or Money Makers:
For Cash rewards, they will be automatically credited to your account.
Good Luck!