Please refer to the following instructions to use our Coca-Cola vending machines.

1) Insert coins or 1,000 yen bill into a slot.
2) Push a button in the bottom side of product you have chosen.
3) Pull up the slot cover and take product from it.
4) Pick up your change from coin return slot after the coin return lever is pushed.

See also “Which coins to use to purchase from a Coca-Cola vending machine.”
https://j.cocacola.co.jp/info/faq/detail.htm?faq=19884