During Apple’s Q2 financial call today, the company mentioned that big-box retailer Best Buy would be supporting Apple Pay in stores later this year, and Best Buy will allow customers to make purchases within the company app using Apple Pay starting today. The news is notable because of Best Buy’s alliance with MCX, or the Merchant Customer Exchange, a retailer’s association that wants to start its own mobile payments platform called CurrentC.

MCX and CurrentC made headlines in November, just after Apple Pay launched, when many MCX members—including Best Buy, 7-11, and CVS— disabled some Near Field Communications (NFC) devices that would allow Apple Pay to work at the chains’ registers. Instead, MCX companies said they would be adopting a more “consumer friendly” option called CurrentC, which would work using QR codes. The most apparent reason for companies to adopt CurrentC seemed to be that it would only work with debit cards—ideally replacing some customers' credit transactions, which require the retailer to pay a transaction fee to the bank, with debit transactions. CurrentC is set to launch sometime this year.

Now Best Buy is saying that it will break ranks with big retailers who have stood in solidarity with MCX, but it still remains committed to working with MCX. "Today’s consumers have many different ways to spend their money and we want to give our customers as many options as possible in how they pay for goods and services at Best Buy,” the company said in a statement.

Ars also contacted MCX, whose spokesperson said that they were not at liberty to discuss the specifics of the Best Buy deal. Still, they pointed out, MCX members are not obligated to forego enabling alternative methods of payment indefinitely. “While all MCX merchants do agree to exclusivity, those provisions are designed to expire and as such as are limited in both time and scope,” MCX said. The company also shared a statement from MCX chief operating officer Scott Rankin:

“Best Buy remains a strong MCX partner and supporter of the CurrentC initiative. At MCX, our core values stem from the customer. Our mission is to create an experience where the customer is empowered and at the center of every action. With that in mind, we understand–and strongly support–our merchant partners’ quest to do what’s best for their customers. As we have stated in the past, we are of the firm belief that there need to be at least 2-3 major players within the mobile payments ecosystem for it to succeed. We remain steadfast and passionate about CurrentC, as well as completely focused on delivering the best mobile commerce solution for our merchant partners and for consumers.”

Besides Best Buy, midwest retailer Meijer has stood apart as being an MCX member that also supports Apple Pay.

For now, Apple’s payment platform is a long way from the critical mass necessary to make paying with Apple Pay commonplace—in part because massive national MCX retailers have held out for so long. In today's financial call, Apple said it has tripled the number of locations that have supported Apple Pay since launch.