Into the Wild (KingMaker AP)
Here Point rules can be found here.
PCs can never have more than 3 Hero Points. Typical uses of Hero Points include:
Extra Action: You can spend a hero point on your turn to gain an additional standard or move action this turn.
Reroll: You may spend a hero point to reroll any one d20 roll you just made. You must take the results of the second roll, even if it is worse.
There are more uses for Hero Points listed at the Pathfinder SRD.