Google is expected to reveal details about Android Pay at its annual I/O conference this week, even as Samsung readies its own separate mobile payment service.

It isn’t clear how different the two payment approaches may be from one another. Samsung uses the Android operating system in most of its phones, but always tends to add its own custom features, apps and interfaces to its Galaxy S smartphones and Note devices. Samsung Pay, a replacement for Samsung Wallet, may be no different.

Samsung is the world’s largest seller of smartphones, which ought to make a difference in its ability to become a major player in mobile wallet services. Apple Pay, which launched last fall with the NFC-ready iPhone 6 and iPhone 6 Plus smartphones, gets much more attention, especially in the U.S., and is the clear frontrunner so far.

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