You can conveniently use the functions of the stores card terminal from your smartphone.Credit card payments can be made by connecting to a reader via Bluetooth, USB, or Serial.■ Main functions1. Card/cash receipt/other simple transaction payment2. Cancellation (for the previous transaction and each payment item)3. Transaction history inquiry4. Agency approval for linking with other apps■ Precautions1. If you use the existing version without updating the application, it may not function properly, so please always update to the latest version.2. For inquiries about purchasing the KSR-03 / KSR-04 reader, registering as an affiliate, or other detailed usage, please contact the KSNet sales representative.3. For inquiries about KSCAT-A integration and user/developer manuals, please contact KnessNet sales representative.■ Required permissionsOS version 11 or lower - Location: Bluetooth devices can be used. - Storage space: Used to store log files and signature images. - App: Used to set app priority.OS version 12 or lower- Peripheral device access: Bluetooth devices can be used.- Storage space: Used to store signature images.- App: Used to set app priority.Other OS versions- Peripheral device access: Bluetooth devices can be used.- Access to photos and videos: Used to save signature images.- App: Used to set app priority.