Gor a startup to develop mobile App (Android and iOS / tablets) and web site.
The key services of App are: payment, money transfer among users, invoicing, storing data in purchasing process (bill/ receipt), data acquistion with camera mobile phone, QR code and bar code reading and generation.
I need frontend-backend.
There are also in the market some references App to be used as example.
Key features: payment system ( PayPal, credit/debit cards, bank account, virtual money, to develop own payment system), money transfer, NFC, Bluetooth, code acquistion and code reading, user profile, chat.