u/trdybo

Hi, I just bought something off offerup but I want to send some extra money. Essentially it was some kid who was selling something to save up for something else. I just picked it up but it turned out that there was more stuff than I thought. I agreed to his price thinking it was only for part of the stuff I received so I wanted to pay him more to cover it and help him save up a little. Unfortunately I only had enough cash to pay his asking price and no extra. I was hoping to send him a check or whatever digitally but don't want to come off as a scammer asking for personal info. How could I go about that?