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What about requiring interaction from purchaser.

Require a photo of the purchase.

It would add a level of social obligation. You could go further and require a tweet explaining the purchase. You could even add a little homily about good manners and not being greedy to the explanatory text.

I think you are doing a very interesting experiment with new financial entities, and I'm curious to see where this leads.

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The homily sounds like a good idea; that's been shown to actually deter some in the past.

To the other points: how would you go about mandating a photo or any other form of interaction from the purchaser? Jonathan has his card picture posted on the website–Starbucks simply accepts that photo as payment, there's no authorization process in the middle where Jonathan could selectively let some use it while disallowing others.

As a demonstration of the possible, using an image is in the category of Minimum Viable Product, the more sophisticated product would of necessity be an APP that hooked into the existing API and would only show a valid payment code if the Conditions Of Use were met.

This could be a web-app or it could be a native one.

https://www.facecash.com

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