I would like to make an order-system with QR-Codes which is online.
How I imagine it to work:
A customer visits a restaurant. There is a QR-Code on his table which takes him to a public webpage where he can order the stuff he wants.
So my question is:
How can I check if the person ordering, is actually sitting in the restaurant without using the phone's GPS location?
My thirst thoughts about this where to use a key printed underneath the QR-Code but the person ordering could just use this key at home if he would just take a photo of the QR-Code.
Hope you understand what I mean with this and could help me out :)