To configure, synchronise, receive notifications and take advantage of your Fitbit or Garmin device’s other features, you will need to install the Fitbit or Garmin Connect app on a modern and compatible smartphone or tablet with a recent version of iOS or Google Play.

For Fitbit Pay: Apple iOS 12.2 or higher, Android OS 7.0 or higher
You can check the list of compatible devices and softwares here.

For Garmin Pay: Apple iOS 12 or higher, Android OS 6.0 or higher
You can check the list of compatible devices and sorftwares here.

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How do I pay for my purchases with Fitbit Pay or Garmin Pay?