Hi,
I just got watch 4 and I'm trying to use google wallet (google pay) but I was not able to add my card to the watch, the card is already in google pay and I was using it, but when I try to add it to the watch I'm getting this message:
double-check your card details: something's not right, please double-check the details and try again.
I have tried to delete the card and add it again and it did not work, also I have tried to add other cards and it did not work, please any solution!?
Update: I have attached images of what I'm getting
Again, I'm able to use google pay without any issues on my phone and the issue only related to my smartwatch
Update: I believe the problem is in the google play services as adding the card happening through it, not through the actual app of google pay, I have cleared its cache and updated and still not working.
Having the exact same issue... i drove me mad, i keep mailing Google Pay support 
just sent them this thread as well. i'm guessing it has something to do with the latest play services update they did as until then, all was working well...
My phones are a Samsung Fold 3 and a Flip 3. My watch is a Galaxy Watch 5. As I said previously I have had no problems until upgrading from the Watch 4 to the Watch 5 this week. And because of the time I spend trying to make it work, it feels like a downgrade
Lost of people with this issue also I see. Do samsung reps even look at these community issues and respond or are we just telling each other there's a common problem ? Regardless if it's samsung or Google issue, would be nice for acknowledgement that someone of either business is listening 
*goes back to rocking in the corner*
