You can use Samsung Pay on your Gear S3 smartwatch with any Android phone
Samsung Pay comes to Gear S3, use your Samsung smartwatch to make payments
How to Use Samsung Pay on Galaxy Watch in Unsupported Regions - Guiding Tech
Set up Samsung Pay on your phone or watch
How To Setup Samsung Pay On The Galaxy Watch - YouTube
Amazon.com: SAMSUNG Galaxy Watch Active Gold (R500) : Electronics
Amazon.com: SAMSUNG Galaxy Watch Active (40MM, GPS, Bluetooth ) Smart Watch with Fitness Tracking, and Sleep Analysis - Black (US Version) : Electronics
How To Setup Samsung Pay on Your Galaxy Watch 4 - YouTube
Solved: Samsung pay keeps popping up on Watch Active 2 - Samsung Community