Must be an issue with just Gpay and Emui/M20P just installed latest version and setup on S9+ and there was no issues with payment at the terminal.
May ask what version of Google Play Services you are on? I just ran into the same problems with my BQ Aquaris X, and other brands do seem to be affected too.
With my Play Services being on version 16.0.91 everything was fine, but after updating them to 17.1.22 my device suddenly didn't respond to any store terminal at all. My GPay app is on 2.88. Still need to try if the downgrade makes it work again as reported by others.
EDIT: Downgrading did the trick, GPay v2.88 is working again in stores with Play Services v16.0.91 !
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