https://doc.sitecore.com/xp/en/developers/hd/20/sitecore-headless-development/create-a-sitecore-services-client-api-key.html
Create a Sitecore services client API key | Sitecore Documentation
Authorize a JSS app to use Sitecore Headless Services with a Sitecore services client API key. The services used by JSS, such as the Layout Service, GraphQL,...
sitecore servicesclient apicreatekeydocumentation