Possibly. Could be anybody. Just know that this technology will mark the death of secure keyed entry and cash as it relates to consumer payments and point of sale register transactions. Millions of merchants, billions of transactions, and trillions of dollars in commerce. The burgeoning revolution has already turned into a free-for-all. Everyone wants in, from big phone companies like AT&T (T) and Verizon (VZ) to the credit card networks like Visa (V) and MasterCard (MA) to tech giants like Google (GOOG), Microsoft (MSFT), and eBay's (EBAY) PayPal unit. Scores of startups have joined the fray; so have traditional banks, retailers, and makers of point-of-sale hardware like VeriFone (PAY). All those contenders are eager to know whether Apple (AAPL), which has 400 million credit cards on file, or perhaps Facebook (FB) or Amazon (AMZN), will enter the game soon. Indeed, Apple seemed to tiptoe into the space in June when it announced that the iPhone will soon hold boarding passes, movie tickets, and prepaid store cards.