Pay, iPads, and Square
I’d put money on Apple becoming its own credit card processor with, essentially, what Square did for the iPad. Built-in NFC—maybe even with a purpose-built iPad, sold separately from others—that small-business owners could jump into with an even smaller cost-of-entry than Square. (I’m including Square’s iPad stand in the cost here.)
Since the software and design and whatever else is already there, though—and while I love the company, I don’t think Square will last much longer—expect Apple to buy ‘em.
…and then expect a verification for “Certified Pay terminal” when the payment handshake (or whatever it’s called) happens.
Just writing this down for the future.