P1 Software Development Description Description for debugging devices Description for App release Description for codes such as permissions, fullscreen, acquisition system versions, etc. Print and customer display description Description for camera code scanning Description for base usage Documentation for custom volume key docking As for the matters relevant to financial payment business connection, please consult Sunmi Technology support(Customer service Tel: 400-902-1168 from Monday to Sunday 9:00-21:00 Holidays excluded)