Samsung Pay Watch is using Near Field Communication (NFC)
and Magnetic Secure Transmission (MST) technologies, allowing users to make a
payment almost anywhere.
Once you have enabled Samsung Pay on your Gear or Galaxy
Watch, you can pay by launching the app, selecting desired card, and holding
your Gear or Galaxy Watch near the payment terminal, even if you don’t have
your phone with you. And it’s safe. Payments have to be authenticated by your
secure PIN.
 
Samsung Pay Watch doesn’t store or share your payment
information, so you can pay without worries.
 
All the Gear or Galaxy Watch is only supported NFC
payment except Gear S3 is supported both MST payment and NFC payment.

Any Samsung & Non-Samsung phones with Android OS version 5.0 or above which supports the Galaxy Wearable application.

If you are using a non-Samsung mobile device with Android OS:
1) Please install Galaxy Wearable App from Google Play Store. 
2) Launch Galaxy Wearable app 
3) On the Galaxy Wearable main page, scroll down and tap on Samsung Pay

 
 
If you are using a Samsung mobile device
1) Launch Galaxy Wearable App
2) Connect your phone to Gear or Galaxy Watch via Bluetooth if it is not connected.
3) On the Galaxy Wearable main page, scroll down and tap on Samsung Pay
* If you can't locate Galaxy Wearable in your device, please install Galaxy Wearable App from Google Play Store or Samsung Galaxy Apps

You can register up to 10 payment cards in Samsung Pay Watch.

1.  Launch Galaxy Wearable App on your phone.
2. Connect your phone to Gear or Galaxy Watch via Bluetooth if it is not connected.
3. On the Galaxy Wearable main page, scroll down and tap on Samsung Pay
4. Tap on "Add card" shown on the screen to register your card.
* There will be a prompt to set up a secure PIN in your Gear or Galaxy Watch if you have not enabled the secure PIN lock.
 
OR
1. Press and hold the Back button on your gear to launch Samsung Pay.
2. Enter in your secure PIN  to authenticate the device
3. Tap on "Add card" and you can register your card.

4.You can either scan your physical cards or enter your cards details to add your cards in Samsung Pay.

5.Depending on the policies set by your issuing bank, Samsung Pay will prompt you to verify your digital card through a one-time-password (OTP) via SMS or email or a phone call to the bank.

No. Samsung Pay app in your mobile phone is different from Samsung Pay in Samsung Wearable app.
You need to register your cards separately in Samsung Wearable app in order to use Samsung Pay Watch.

Once you have activated Samsung Pay Watch and added your cards, simply press and hold the ‘back’ key to launch Samsung Pay. Select your desired payment card, press the Pay button on your Gear or Galaxy Watch and place your Gear or Galaxy Watch over the payment terminal to pay.

1. Press and hold the Back button to launch Samsung Pay.
2. You will need to enter PIN to authenticate the device.

3. The last card used or latest card added will be shown (If you have more than one card added, select the card you want to pay by swiping left or right,  or by rotating the bezel to select card)ticate the device.

4. Place your Gear or Galaxy Watch over the MST or NFC area of the payment terminal to pay. 
*Only Gear S3 supported MST and NFC payment.

Samsung Pay requires an active internet data connection for card registration and activation. However, an active internet data connection is not required to make in-store purchases. Ideally, the device should connect to the internet once per day to ensure that Samsung Pay stays updated. Most cards will allow you to make up to 10 transactions before you will need to connect to the internet and refresh the Samsung Pay information.

The transaction history is shown in the Samsung Pay app in Samsung Gear & Galaxy Watch on Smartphone devices

The “retry” button appears when the countdown timer has reached its end and the device has not detected an MST or NFC payment or has not received a notification of a successful payment.
The “retry” button allows you to restart the payment process, one additional time, without reauthorisation by using your Samsung Pay PIN.
 
Note: When a MST or NFC transaction is completed, the retry button will not be shown. Additionally, if a payment success notification is received, the retry button will not be shown.

Yes, you can still use Samsung Pay Watch  without connecting it to your phone.
Most cards will allow you to make up to 10 transactions* before you will need to connect to the internet and refresh the Samsung Pay information.
* Please note that the number of transactions depends on your card issuer's policies. Please check with your card issuer.

Each issuer have their own limitation on the number of devices each card can be registered into.Please try to remove the card from the Samsung Pay on your mobile device and try to add it again in Samsung Pay Watch.

Samsung Pay Watch protects your card information with the advanced security by using tokenisation, KNOX and PIN protection to make secure payments. Cards data is synced to Gear or Galaxy Watch from your mobile device via a secured Bluetooth channel.Once Samsung Pay is activated on your Gear or Galaxy Watch, your smartwatch will enable the PIN protection. You must enter your PIN each time you put on the Gear or Galaxy Watch, and you won't need to enter your PIN again until you take your Gear or Galaxy Watch off.

Yes. There is only one secure PIN used on the Gear or Galaxy Watch

If the Gear or Galaxy Watch are strapped on your wrist, you only have to enter the secure PIN once before all subsequent payments. If you take the Gear or Galaxy Watch off your wrist, you have to enter the secure PIN each time before putting the Gear or Galaxy Watch into payment mode.

If your Gear or Galaxy Watch are lost or stolen, your payment information will not be accessible without your secure PIN. For added security, the Samsung 'Find My Mobile' service can remotely lock or delete your payment cards on Samsung Pay.

All Gear & Galaxy Watch have the NFC transponder located near the top of the watch. However, only Gear S3 has the magenetic coil in the back for supporting MST Payment.
Device should be placed approximately an inch over the NFC or MST area of the payment terminal in order for the payment to work.

After 10 wrong tries, Samsung Pay Watch will reset. All information and cards registered on the Gear & Galaxy Watch will be deleted.