Just because Apple was able to secure a partnership with a large number of retailers for their new Apple Pay NFC mobile payment service, doesn't mean all retailers are welcoming it with open arms. In fact, several of the biggest retailers are refusing to offer access to Apple Pay, including Walmart, Best Buy, CVS and Rite Aid.
It turns out that these companies are working together to try and get their own mobile payment platform started. They are all part of something called the Merchant Customer Exchange (MCX) which is a consortium of companies working to develop something called CurrentC.
What's interesting about CurrentC is that it completely bypasses the Credit Card companies. Here's a quote with more of the details,
It's hard to see this CurrentC product getting enough momentum to catch on with consumers, especially since it isn't as easy to use as Apple Pay. It looks like we are getting ready to enter a phase of "mobile payment platform wars," with offerings from Apple, Google and now this MCX consortium clogging up things even further. Which one do you think will come out on top?