Ask HN: A universal app for buying anything anywhere?

I've found a job that I like, and will keep for a while. So my startup ideas are useless to me. Here's one I like. I wonder why it hasn't been implemented yet.

I'd like to pay for things with my phone. I call up Jimmy Johns twice a week for a sandwich. They take my credit card every single time, even though they know my name and address. I suppose they don't want to keep credit cards in their system. Fine. But the same thing occurs everywhere throughout the web. I find something that I want to buy online, and I have to type my number in again.

There are solutions out there. Chrome saves some cc information. But not all sites implement it. There are plugins, of course. But if I switch over to my iPad, or iPhone, or a friends, then I have to go through all this again.

So the new iPhone is going to use NFC to send some kind of tokenized cc information for me to pay for stuff in real life. Great.

But what about buying things online? What about buying things remotely (like over the phone).

Here's what I'd like to see, an app that can be pinged by anyone, to notify me that someone would like to charge my credit card. I call Dominoes. They take my order. I get a push notification saying Dominoes wants to make a charge. I swipe, enter a code, and the charge goes through.

You could pay by phone for anything, anywhere, using your bank account, credit card, whatever: but you'd only have to enter that information on installation of the app.

So that's the idea. Implementation details might include using Stripe connect as the backend. Maybe implementing IOS's thumb-reader, if that's available as an API (not a IOS dev here).

I can't quite understand why this doesn't exist yet, or why it is not in wide use, or if it is in wide use, why I haven't heard of it.