The SamsungPay payment method can be shown only through our mobile SDKs (Native IOS SDK, Native Android SDK, React Native SDK, etc). To know more about how to activate it, seek the "SamsungPay" section under the solution article related to the mobile SDK you are using from our Mobile SDKs category.
Unfortunately, this feature is not available yet through any web integration such as PT2 APIs endpoints and eCommerce plugins.