CHACOCO is the official app from Itoen, a well-known beverage company in Japan. This app allows users to purchase products at discounted prices from Itoen vending machines nationwide. By using the app, customers can accumulate stamps for every purchase, and once they collect 15 stamps, they can exchange them for a free ticket to get a product for free.

In addition to the stamp system, the app also provides users with campaign information and updates on new products. To make a purchase, users simply need to press the product button on the vending machine, touch the app icon on the QR code reader, scan the displayed QR code with the app, choose the payment method, and complete the purchase.

Please note that the app may not have payment functionality available in certain regions, including Okinawa. However, all other features of the app can still be used in these areas. The app is constantly expanding its services, so users can expect more features and promotions in the future.