[Balance inquiry method]1. Click the Register Card button on the first screen to register your card.2. When registering a card, an authentication number is sent via SMS. Enter the received authentication number to complete card registration.3. After that, you can check your balance on the authenticated smartphone.[Merchant method]1. Click the Affiliate Search button on the first screen to move to the Merchant Search screen.2. On the Merchant Inquiry screen, the user can move/enlarge/reduce the map to check the location of the desired merchant.