1. In my opinion, the final result of the game should be taken into account, and whether it's in regular time or extra time doesn't matter.
2. If you bet on a draw, you'll get 2 (or 3) points if the match ends in a draw, even in extra time.
That's also a good approach.
The main thing, in my opinion, is that you can earn the same maximum number of points for a match, whether you bet on a win in regular time or a draw in regular time (or taking extra time into account).
And an additional point for a team advancing would give the prediction a sense of completeness.
Mexico - Sweden 2:2
South Korea - Germany 0:5