His sign says "ANYTHING HELPS GOD BLESS" followed by a QR code.
I scan it with my phone out my car window, and transfer a dollar (minus a small processing fee) straight to his pre-paid Visa. The confirmation email includes a link to view his Visa statement, in case I want to know what he spent my dollar on. If I was a Premium Patron, I could check his past purchases and balance before making the transaction. I idly wonder who would want to buy the aggregate data of the spending habits of homeless people. Somebody must; the company seems to be doing pretty well.
I realize as I'm driving away that I never made eye contact with him. For the next few seconds I wonder what his face looked like.