The linked article provides very little info on how it actually works. What's the point in writing about something, if you are not going to say anything meaningful?
I just interviewed with Venmo and although they declined to offer, I want to say that they were some of the brightest and most focused people I've had the pleasure of meeting. We discussed Touch a bit in the several rounds of interviews and all the members were clearly excited about it and loved to discuss technical details and design decisions that went into making Touch.<p>So congrats, Venmo team!
The previous title on this HN post was more informative without context on what Venmo or Touch is: "Braintree Launches Venmo Touch: One Touch Payment Across Apps"