What is the tie breaker rule for the Champions League?

In the Champions League, if two teams have the same number of points in the group stage, the tiebreaker is decided by the following criteria in order:

1. Goal difference
2. Goals scored
3. Head-to-head results
4. Away goals scored in head-to-head matches
5. Away goals scored in all group matches
6. Total wins
7. Total away wins
8. Fair play conduct
9. UEFA club coefficient