The official Yaya app has been released!With this app, you can receive the latest information on Yay and use convenient functions.[What you can do with the app]You can do the following using this application.1. Check the latest information!You can check the service contents of Yay.Also, a message will be sent from the store so you can always check the latest information.2. Check the information on my page!You can check the usage status of YAY.3. Tell a friend!You can introduce the Yay app to your friends through SNS.4. Packed with other useful functions!