Straight from their website...

In the case of single table tournaments players will earn 1 point for every dollar paid in tournament fees. For example, in a $50 + $5 fee tournament, a player will be awarded 5 points. For 1-on-1 tournaments with less than a $1 fee, players will still get 1 point. In the case of multi-table tournaments players will earn points equal to 10% of the value of their buy-in; fractional points will always be rounded up. For example, in the case of a $10 tournament players will earn 1 point while in the case of a $15 tournament players will earn 1.5 points, with this always being rounded up to an even 2 points.