On my C45 I have the latest version of Wear OS (2.3) and systemversion "H". Before christmas I added a supported Mastercard into Google Pay and it worked fine the one time I got to test it for making a payment. I have not used my C45 for a few weeks now, but yesterday I was going to use it, but I noticed the Google Pay app was missing. I tried to redownload it from Google Play but it was only disabled so I just had to enable it. Now when I start the app it says "Can't use Google Pay: Google Pay hasn't launched in this location yet.Check again soon." That is simply not the case as I have used it before and my country is enrolled and I do have a supported credit card. Any of you experiencing the same issue? Just to be clear: I dont think this is a TAG Heuer issue, but a WearOS/App issue. Another thing - if I reboot or shutdown/turn on the watch - I need to enable Google Pay each time. It seems to disable itself. I would want to flush all data for the app if possible, but I have not figured out how do do that. I have not tried to reset the watch to factory (yet).
I hit similar issue. So I ask the dev , the official response from Google is that : pay of wear is is only available for certain countries, so googlG Disable it if it detected you are not located there. They are telling us to use pay for Androids (phone ) until wear pay is enable.
Unfortunately - it seems like you are right. My country is only supported on phone payments, not WearOS payments. Very strange and onfusing that they are supported different! Like this guy, I had already used it - but seems like it dissapeared in a recent update: https://support.google.com/wearos/thread/690888?hl=en