Translation:Have you paid?
계산 is the word for calculation, sum, or bill. Literally, this question would translate to "Have you done the bill?"
what's the difference between did you pay (wrong) vs have you paid(correct) ?
Both are correct translations, since Korean was newly added, it seems that they haven't yet added all correct answers. If something like that happens again, flag the question for them so they can add your answer!