Yes. If you have a device that supports iris image, you can use iris image as a form of authentication.

Please follow the steps below :
1. Please check whether you have registered iris image in your device.
If not, please register your iris image in your device.
2. Launch Samsung Pay app, select Settings.
3. Select Iris and click on the Irises button.
4. Enter the Samsung Pay PIN you created.
5. Position your device for Iris Image verification.

1. On the Samsung Pay app Settings screen, tap on Lock screen and security.
2. Tap Irises 
3. To use your irises image to unlock your device, you must set a pattern ,PIN, or password. Remember it, as you will need to use it when the device has been restarted or device has not been used for more than 24 hours.
4. Before using the iris image recognition camera and LED, read disclaimer and keep the precautions in mind. Then, tap OK
5. Read the on-screen instructions and tap CONTINUE. To register only one iris of your eyes, tap You can choose to register only 1 iris image.
6. Now, hold your device about 25~35cm away from your face with the screen facing towards you and position your eyes in the circles shown on the screen. And, remove your glasses or contact lenses because wearing glasses or contacts when unlocking your device or verifying your identify may cause the device to have difficulty recognizing your irises image.
Keep your eyes open and look at the top of the screen. Iris image recognition may not work properly in direct sunlight. 
For best results, avoid direct sunlight and perform this process indoors. 
And, keep the camera clean as dirt and smudges on the iris image camera, LED sensor, or proximity sensor may cause the device to have difficulty recognizing your irises image.
Position your eyes inside the circles on the screen and open your eyes wide. The iris image recognition camera will scan your irises.
7. When an iris image lock pop-up window appears, tap ENABLE to use your irises image to unlock the screen.
8. When you swipe in any direction on the locked screen, the iris image recognition screen will appear.
Look at the screen to scan your irises. If your iris image is not recognized within 10 seconds or you are close to it, the device will automatically stop iris recognition to protect your eyes

Screen accessories such as screen protectors(privacy protection films, tempered glass protectors) & stickers might obstruct the proximity/light sensor area of the iris image scanner.
If you are using any of the above accessories, please check if they blocking the proximity/light sensor area.
Dirt and debris on the iris image camera, LED sensor, proximately sensor may cause the device to have difficulty recognising your irises image.

Yes, It is possible to register iris image pattern using one eye.

No, you are limited to have 1 iris image registered at any point in time to be used for authentication purposes per device

Yes, It is possible to use both iris image scan and fingerprint authentication together. Simply select your preferred method during authentication.

Wearing glasses with a strong prescription, sunglasses or color contact lenses may cause the device to have difficulty recognising your irises image. If you are wearing such lenses, remove them before registering your irises image.
And, when wearing glasses, the light reflected from glass surface can interfere the sensor, leading to failure in iris image recognition in some cases. If it is the case, please try taking your glasses off or adjust the angle of sight.

Iris image information is digitized and saved in trust zone as an encryption code.

Magnetic Secure Transmission or MST, is a groundbreaking method of sending data using magnetic waves. MST replicates a card swipe by wirelessly transmitting magnetic waves from the supported Samsung device to a standard card reader. MST turns every card reader into a contactless payment receiver.
 
*Only available in selected country, markets and devices. Payment solutions and available features may vary depending on market, carrier and service providers.
* Starting from 2021, all Samsung devices launched in 2021, including flagship devices, will no longer support MST.

Near Field Communication or NFC is a method of wirelessly transmitting data using radio waves. Samsung Pay uses NFC to wirelessly transmit payment data to payment terminals with NFC readers that have been activated for use.

For Samsung Pay, either MST or NFC technology can be used to make secure, contactless transactions. The key difference is MST works with any card terminals, which makes Samsung Pay the most accepted mobile payment service on the market. 

*Only available in selected country, markets and devices. Payment solutions and available features may vary depending on market, carrier and service providers.
* Starting from 2021, all Samsung devices launched in 2021, including flagship devices, will no longer support MST.

In the context of Samsung Pay, MST and NFC have the same level of security. The payment information transmitted by both MST and NFC is protected using tokenization.
 
*  Only available in selected country, markets and devices. Payment solutions and available features may vary depending on market, carrier and service providers.
* Starting from 2021, all Samsung devices launched in 2021, including flagship devices, will no longer support MST.

The device must be placed within 5cm of the card reader in order for MST to work.

* Only available in selected country, markets and devices. Payment solutions and available features may vary depending on market, carrier and service providers.
* Starting from 2021, all Samsung devices launched in 2021, including flagship devices, will no longer support MST.

The fingerprint scanner is very accurate. It has a “False-Acceptance Rate” less than .00002%.

You can enter the Samsung Pay PIN you created as a backup option. if the fingerprint is not recognized after 20 consecutive attempts and the Samsung Pay PIN has not been entered, Samsung Pay will remove the data from the app and deregister all linked cards.

All payment information in Samsung Pay will be deleted. You will need to set up Samsung Pay and add your payment card information again.

When performing a factory data reset, all payment information in Samsung Pay will be deleted. You will need to set up and add your payment card information into Samsung Pay again after your device has been reset.

Please contact the card issuer and verify you are adding an eligible payment card. Some cards from participating banks may not be supported in Samsung Pay.
Be sure that you are connected to the internet via a Wi-Fi network or your mobile data connection as Samsung Pay requires an active internet connection when adding a payment card. 
If the Samsung Pay application crashes even after clearing the data under the Application Manager Settings, please re-install the Samsung Pay application and try again.

Please re-install the Samsung Pay application and try again.