App Engine service accounts
For applications running on App Engine, Google provides the App Engine app default service account, named <PROJECT_ID>.@appspot.gserviceaccount.com. This account is created on a per-project basis and lives alongside your other service accounts. App Engine services use this service account by default when interacting with other Google Cloud services, such as Cloud Storage and Datastore, in the form of application default credentials. As we covered in Chapter 3, APIs, CLIs, IAM, and Billing, application default credentials provide a standardized method for authenticating services running in different environments, including local development machines and App Engine.
Do not delete the App Engine default service account ...
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