Water vending machine payment system

I'm looking to implement a mobile wallet and RFID based water vending machine payment system for more than 7 machines. I would also like a backend dashboard (cloud based) for detailed accounting and analytics that accurately display real time device data such as Consumption rates and Transaction reports. I prefer a payment system that is secure, user-friendly and cost-effective. To maximize efficiency, I would particularly like the payment system to be compatible with a local telecom API for mobile payment and cell phone based top up of RFID wallet using NFC. Above all, accuracy and reliability are of utmost importance to me.