Yes, the ECG function does work on the Swiss-distributed Galaxy Watch 8 Classic, assuming you're using it with a Samsung-compatible phone and the Samsung Health Monitor app installed with the correct regional settings.
Thank you very much for letting us know. We will be happy to pass this on internally to the relevant department and hope that this will be checked promptly.
This has nothing to do with the origin of the merchant, but with the compatibility between your credit card and Samsung Pay. Not every bank supports Samsung Pay.
I bought the watch and Samsung Pay works without any problems.
Check with the issuer of your credit card to see if it is compatible with Samsung Pay, if so, it shouldn't be a problem.