I have limited knowledge with regard to altcoins as a whole, but "based on this page", it seems that you sent these two transactions through Binance, so you might want to "report him/her on Binance" as well ^{[it may not help in getting the $40 back, but it might prevent someone else from making the same mistake]}.

If I were to guess, I'd say it probably had something to do with the fact that OP also sells digital goods stuff, and thought maybe all of the existing sellers are honest.
^{@Maxcarter: Unfortunately, scams aren't moderated here!}

Would you mind doing the same thing for the conversation part?
^{- Don't forget to censor/blur sensitive parts.}