Same here, buddy... after cleaned gpay cache and data, restore NFC settings, and reboot device, gpay back worked again... (POCO F5 - Marble)
UPDATING -----
Stopped again...
Same problem here. Poco F5 (marble). Gpay worked fine until last week, after this, stopped work... Tried:
• Google Service Framework
• Clear all data and cache Play Store and Play Services
• Root and use Safenet Fix module
• Back to 5 last rooms (14.0.25 / 14.0.23 / 14.0.22 / 14.0.21 / 14.0.20...