Known error messages.

Service Account Token Flow Auth flow env variables.

Key Flow optional env variable (1).

Key Flow optional env variable (2) using file paths.

KeyFlow handles auth with SA key.

KeyFlowConfig is the flow config.

ServiceAccountKeyPrivateResponse is the API response when creating a new SA key.

TokenFlow handles auth with SA static token.

TokenFlowConfig is the flow config.

TokenResponseBody is the API response when requesting a new token.