I fucked up big-time, y'all.
After years of people telling me I should play The Binding of Isaac, I noticed online that there were copies of Rebirth available for quite a few platforms. I figured I'd get the PS3 version. (I may have misread "PS4.")
I buy a $20 PSN card (there's no way I'm ever giving them any account information), do a search, and download the first thing that comes up.
Somehow it didn't occur to me that you could download Vita-only software using the PS3 version of the PSStore.
Yeah, I now have a copy of a $15 game that I can't even play. Sony's not going to issue me a refund for this, are they?