After the galaxy watch 4 update R870XXU1EVA8 Gpay stopped working . On nfc contact the watch displayed this error "Your watch cannot make contactless payments as it doesn't meet software standards". After resetting the watch, reinstall Gpay on the watch I can't add the previously working card. The process stops at the verifying step with the message " Couldn't finish setup to pay in stores". On the phone it works perfectly.