It is a one-time only.  No recurring payments.  Very quick and easy. As I mentioned in your other thread, if you are very concerned about privacy, etc.  Simply go buy a prepaid card and use that to make your donation purchase.  It's what I did and worked like a charm.

I donated last year and had absolutely no issue at all.  It isn't self-renewing.  If you want to donate and have concerns, I would simply get a prepaid card that you can load money on and do it that way. That's what I did. It's pretty much instantaneous as well. Hope that helps.