So I wanted to surprise my GM (SeventhChevron) with some more Starfinder material, but he already owned the PDF I bought him, Alien Archive 1, and now neither of us are sure how to proceed. Is there a way we can refund the PDF or transfer it to my account?
No problem, these things happen. We can do either of your suggestions to resolve this. Would you like to keep the copy of Alien Archive, or would you like to just return the purchase completely?