When I pay for something I don't hand the money over directly. I put it in a small tray.
1 Answer
Most "officially", it is called 「カルトン」.
As it says in the Wiki article above, it is also called 「キャッシュトレイ」、「コイントレイ」、「釣{つ}り銭{せん}トレイ」, etc.
For those interested, I just found an article on this subject in the Japan Times.
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2I read that JapanTimes article a while ago and was gonna link it when I saw the question in "Hot Network Questions" Commented Jan 25, 2017 at 23:45