You can't just go to any court..you have to go to court in county where ticket was issued..if that was in Raleigh area it would be Wake county court in downtown Raleigh. Unless your traffic citation was very recent or over $500, I wouldn't worry about obtaining proof of payment. Chances are you won't be asked at interview.
http://www.nccourts.org/County/Wake/Default.asp
http://www.nccourts.org/County/Wake/Default.asp