Money deducted from your LFS account which you can add money to, although if like many here you overpaid for a previous S1 or S2 license, then you already have a positive account balance.
Just read everything in the "My LFSW Credit" section, including the "Payments and Expenses" tab. I thought it was all very clear.
Sounds cool, Scavier I don't have much use for pubstats and whatnots myself but I'm sure it will be made full use of by others. Actual game patch content looks fabulous!