A startup idea , very close to amazon go

So as you know amazon go is not there in india . So I wanna use this opportunity. So imagine a supermarket. The gate of which is like a metro where u scan a qr code ( there will be an app ) and u enter , so ur shopping starts right there . U move through the store , infact in the app , we will have a live map of the store which will show ur position and which things is in which part of the shop so you directly go there instead of wasting ur time . U pick things , there would be cameras which will add that thing to ur cart ( in app ) .

After picking up things , u go up to the gate . scan the qr code , as soon as u scan the gate will open.

here comes the juicy part , assuming people won't be violent . there would be something like wallet in ur app in which u upload money. Now at the gate . U scan a qr code , then gate will open and money from ur wallet will get deducted. And in case u don't have sufficient money , gate will not open . In that case u need to keep things back in the store to optimize wallet balance or u may add money then and there .

The gate will not open until and unless , ur bill <= wallet balance .

So this is kind of a vague idea at surface level .

Criticisms are welcome.