If you're using a staging site or localhost in addition to a live site, you can use the same key as for the live environment, if the domain name is clearly a dev or staging site.
Here is a list of whitelisted domain that we allow for development sites or localhost:
TLDs that are considered as dev or staging:
localhostlocal*.dev*.test*.local*.staging*.example*.invalid*.myftpupload.com(GoDaddy)*.cloudwaysapp.com(Cloudways)*.cloudwaysapps.com(Cloudways)*.wpsandbox.pro(WPSandbox)*.mystagingwebsite.com(Pressable)*.tempurl.host(WPMU DEV)*.wpmudev.host(WPMU DEV)*.instawp.xyz(InstaWP)*.wpengine.com(WP Engine)*.sg-host.com(SiteGround)dev-*.pantheonsite.io(Pantheon)test-*.pantheonsite.io(Pantheon)staging-*.kinsta.com(Kinsta)staging-*.kinsta.cloud(Kinsta)*.flywheelsites.com(Flywheel)*.flywheelstaging.com(Flywheel)*.mysites.io(Flywheel)*.azurewebsites.net*.amazonaws.com
Subdomains that are considered as dev or staging:
local.*dev.*test.*stage*.*staging*.*