On a majority of devices you will find the NFC chip is located towards the center of the device.
Tip: For the best results when taking a Tap to Pay payment, the card or NFC device should be placed toward the center of the back of your device. Process a test payment to locate the NFC chip on your device.
No, when Tap to Pay on Android is enabled, it will prevent your device from charging contactless cards in your mobile wallet.
However, if you use a phone case that holds physical cards, we recommend removing them from your phone case to prevent accidentally charging your own card. You can also disable NFC in your Android device settings when you aren’t processing Tap to Pay on Android payments.
To do so:
Navigate to your device Settings > Connections > NFC and Contactless Payments.
You may notice the number on the payment is different from your customer’s physical payment card number. The reason behind this is that when a contactless payment is made (through Apple Pay, Google Pay, or Samsung Pay) a tokenized number is generated to serve as an ID for the payment. To clarify, the actual card number isn’t used for the NFC payment itself, but rather this generated payment token.