Well, my understanding is Robo, the site owner, has set up and personally handles all donations himself. And he has a few options. PayPal is one such option. So far I've never heard of any serious issues with the donations.
As far as keeping track, no idea. It likely depends on how you pay, I would guess. But either way I'd keep track myself.
This is all second hand information, though. Except for the PayPal option which I've heard Robo mention.