We need to a simpler version of Khatabook, an app already on laystore.
-Create & manage multiple account books
-Add customers in an account book
-Make transactional entries, option to edit/ delete entries
-Share the transactional details via sms and whatsapp through the app
-Showing net balance of transactions
-Backup on cloud
-Login via mobile no. and OTP
-Internationalization of app (options of 2 languages while logging in for the app)
You can download Khatabook from playstore to get a better understanding of the user flow.