Place it as the final beat in a sequence, right after the decision is made. Open with the Classic Error Sound Effect for a rejected card, then let this clip close the scene, and follow it with the Bell Ding Sound Effect only when a second confirmation is needed.
关于此声音
This clip is one brief electronic tone, just under a second long, with no voice or music in it. It feels instantly satisfying and a little cheeky, like a tiny green light for a correct choice. It comes from the card validators on Istanbul IETT public transport, where tapping a travel card produced this confirmation tone when the fare was accepted.