- GCP_OAUTH_CLIENT - GCP oAuth client ID
- GCP_OAUTH_SECRET - GCP oAuth client secret
- GCP_OAUTH_REDIRECT_URL - redirect URL upon a successful oAuth authN
- GCP_SHEETS_CREDENTIALS_BASE64 - b64-encoded credentials for svc account linked to datasource spreadsheet
- JWT_SECRET - arbitrary string for generating JWTs for internal endpoint authN
- SPREADSHEET_ID -
- USER_1 - email address that can authN to the internal endpoints
- USER_2 - email address that can authN to the internal endpoints
- PORT - port for echo webserver to listen on
- ENV - "dev", "prod".