Many XPs are rewarded after finishing a game. No finish, no pay-out regardless.
But, shot XPs are awarded with each shot, one by one, and CDP boni are awarded after your first shot in a game. They are on your account even when you don't see the accounting pop-ups.
My two Pfennig: Play multiplayer games only for the fun of the game and the competition, nothing else.
Not for credits, not for XPs, not for average!