Garmin Forerunner 645: How To Set Up ‘Garmin Pay’ YouTube Video By Garmin.
Given that Garmin Pay was available on my star-crossed Garmin Vivoactive 3, I am somewhat familiar with the macro process though I never got around to setting it up.
FitBit Pay is available on my incredibly frigid (and ugly and extremely temporary) Fitbit Ionic — BUT there is a stupid, fatal flaw. If you set it up you have to always use a PIN to unlock the Ionic — not just when you want to use Pay! Get that? If I set up Pay I will have to continually enter my PIN. Of course I am not going to do that. It is bad enough trying to get it to wake up.
The above YouTube video is informative, sweet & short. Garmin did a good job. Definitely worth watching.