Affiliate payment with Pro Sites

I am running a multisite with the Pro Sites plugin and I just want to make sure I understand how the affiliate plugin pays out. There is an option to set a dollar amount for a 1,3 and 12 month payment. This is the amount paid one time for a subscription at every level? Or, is this amount reoccurring every time a referred customer makes a "payment" as long as the cookie is active? Please clarify.

Thank you,
David