Recently I've been playing with Stripe to put a payment form (url) into a QR code. So the cashier prints the receipt, the user scans the QR code and pays using the form on her iPhone/Android.
But why would merchants or users prefer this solution? why not just use the credit card? Perhaps these kinds of ideas are what pg calls made-up startup ideas.
I do see many advantages; credit cards are insecure (all the important info is written on them) and even debit cards machines can be modified or replaced to save your password and card info; but with the phone there is none of those risks. Also I would like to mention that there is no need to read it from a printed receipt, you read it from another device the cashier haves and that is it; wish is a green solution and can be promoted as such.
And if someone steals your phone (hopefully) you have a pattern to unblock it and before the thief can crack it you cancel the app account or change its password.
But why would merchants or users prefer this solution? why not just use the credit card? Perhaps these kinds of ideas are what pg calls made-up startup ideas.