Write an Android application // NFC//Webservices

We must upgrade our web application for project like"prepayment card". Till now we did have web aplication with Microsoft SQL database and operator did scan card with barcode and enter value which client did spent. Now we would like to make simple mobile application where operator will read NFC card with mobile phone with Android system. Application should then comunicate online with our database on server and write on mobile application who is owner of the card. After that operator should write amount which is spent in this application and this amount must be written to our database which is online ( in new record in database must be written also date/time/mobile id/amount/card number). We will use NFC card just to read UID number from card. All details about card holder will be written in our web application (it is like administator application) which should comunicate then with mobile application, You need also to create webservice to communicate betwen mobile app and database on our server,