Dear there.
I think we could have an server, hosting in some host provider in Australia, working as your server.
I will develop app, you let your customer install them ( I could work on Android, iOS and Windows Phone), then they could login and scan the QR code (you generate and print them via our web admin)
So, user come to your coffee shop, install app (if not), login and scan the code. Loyalty information will be saved
Is this okay :)
My bid for Android app and server work. I really serious, looking forward to hear from you
Thanks & B/R