http://www.forbes.com/sites/stevenbertoni/2014/09/10/apple-pay-is-doomed-unless-it-can-do-these-7-things6) Offer the service to everyone
Payments is a volume game. As of now, Apple Pay is will be available to the relatively rich–people who can A) afford an iPhone and B) customers who use credit cards. Worldwide, the number of people who can do booth is small. Payment processing needs to be a global business. How do you fix that? Make Apple Pay an platform-agnostic app–like Google Maps or PayPal’s wallet. Apple must also accept all kinds of payments: credit cards, debit cards, prepaid cards, bank account transfers–maybe even Bitcoin.