To facilitate this would require a full breakdown of your expenditure being submitted to the merchant’s bank, the acquiring banks and intermediaries, and ultimately to the issuing bank. Technically that would be a feat in itself.
And although I have nothing to hide, I am not convinced that I would want all of my detailed purchases to be available to these companies/organisations. Your bank and lots of other commercial enterprises (I’m thinking Google and Facebook here) harvesting a helluva lot of information, and knowing more about you than you might care to share. Everything about your life will be targeted and monetised. A scary proposition.
Fancy your inbox being bombarded with emails reminding you that you could have saved 50p buying that last pack of condoms from retailer ‘x’ instead of ‘y’? Or how about you’ve tried brand/flavour ‘x’ of something, have you tried brand/favour ‘y’ instead? And here’s a discount voucher to entice you? It potentially very powerful; which is precisely why the big retailers spend lots of money on their own loyalty schemes. But you have a choice there - sign-up or don’t sign-up to a loyalty scheme. If the granular detail of all your purchases are automatically uploaded, digested and processed at point of sale, you may not have a choice and lots of organisations will know an awful lot about you. Arguably too much.