Samsung Pay launched in the UK earlier this year for select Galaxy smartphones, but this will be the first time you can use it on the company's range of smartwatches.
To be able to use it on your Gear S3 you'll need to update to the most recent software version of Samsung Pay within the Gear App on your phone and make sure your card is registered and ready to go with Samsung Pay.
This is the first time you'll be able to use Samsung Pay without a Galaxy smartphone too as it works if the wearable is paired with any Android device running 4.4 KitKat software or above.
There's currently no word on a launch for Samsung Pay in the UK for the Gear S2 or the Gear S2 Classic watches despite it being available for both those devices in the US.
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James is Managing Editor for Android Police. Previously, he was Senior Phones Editor for TechRadar, and he has covered smartphones and the mobile space for the best part of a decade bringing you news on all the big announcements from top manufacturers making mobile phones and other portable gadgets. James is often testing out and reviewing the latest and greatest mobile phones, smartwatches, tablets, virtual reality headsets, fitness trackers and more. He once fell over.