You can easily check the balance of the card by reading the balance inquiry card number on the back of the card using the camera function of your smartphone. Since you can record the card number, you can easily check the balance of the card once registered from the next time. If you register multiple cards, the ones with the shortest expiration date and the ones with the smallest balance will be listed in order, which is convenient when using the cards.This app reads the card number, but we think it is safe because you need to show the card at the actual store to use the card. The card number is saved in the app at the request of the user, but the read number and the saved number will not be sent to a third party via the network etc. This application does not collect card numbers or user usage status.Please: This app is not an official app. Please do not make inquiries about this app to Skylark Holdings Co., Ltd. as it may cause inconvenience to the other party.