What is Tap to pay, and how do I use it?
Tap to pay is a feature for Windows Phone that allows you to set up a credit or debit card, then tap your phone to an NFC (near field communication) reader to make wireless transactions. Not all phones support NFC, and even fewer support making NFC transactions. Here's what you'll need to use this feature:
• A phone with a built-in NFC chip – Many Windows Phones have one. To find out if your phone does, go to the App list and tap Settings Settings icon. If you see NFC in the Settings list, then your phone has a chip inside it.
•A mobile operator that supports NFC transactions – At the moment, only a small number of mobile operators offer phones that support this feature. However, we're working hard to get additional mobile operators on board, and we expect the number of Windows Phones that support NFC transactions to grow.
• A payment SIM card in your phone – This is a special, secure SIM card that you can only get from your mobile operator. If your phone supports multiple SIM cards, the payment SIM must be in SIM slot 1
Wallet FAQ for Windows Phone | Windows Phone How-to (United States)