Используйте приложение APKPure
Историческую версию Kasin Referral можно получить на Android
Это приложение используется для хранения реферальных пользователей и поощрения
There is no signup option openly. System provide the login details to user i.e. only authorized can access application and refer to other user then he will get incentive as referral bonus. As well as user earn 500 incentive points he may transfer points to bank