It's requesting your password to access stored payment information. You can manage that here:
https://support.google.com/googlepay/answer/16580822?co=GENIE.Platform%3DDesktop
Bigger picture, Chrome is a notorious resource hog on Macs. Installing it also installs multiple ‘helpers’ from Google that run in the background, and their purpose is not to help you but to help Google (keep in mind that Google’s primary source of revenue is using your data to drive targeted advertising). Even if you aren’t running the Chrome app, those system extensions are always running in the background. I’d recommend deleting Chrome and all related components.
https://chromeisbad.com
If you are looking for something other than Safari, consider Firefox or Brave (the latter is based on Chrome code but without the Google baggage).