I require an app for my customers (with login and password) to view there daily electricity usage. I have a specific excel format which I should be able to upload on the app everyday and it should notify the specific customer of their usage daily. It should also have a complaint section or a call back button service. App needs to be updated regularly. Furthermore, I want to link a credit card payment service, so that if they pay online, I get updated with the CC details and I can deduct money. Or I will give you an API which you should be able to input it into the app. App should be very easy to use and with a big buttons.