credentials.json

{
  "type": "service_account",
  "project_id": "proj",
  "private_key_id": "xxx",
  "private_key": "xxx",
  "client_email": "foobarbaz.iam.gserviceaccount.com",
  "client_id": "123123123123",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://accounts.google.com/o/oauth2/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/foobarbaz"
}

google_auth.py

# service account bez consentu
# https://developers.google.com/analytics/devguides/reporting/core/v4/quickstart/service-py
from apiclient.discovery import build
from oauth2client.service_account import ServiceAccountCredentials

SCOPES = ['https://www.googleapis.com/auth/analytics.readonly']
KEY_FILE_LOCATION = '../cred/credentials.json'
VIEW_ID = 'xxxx'

credentials = ServiceAccountCredentials.from_json_keyfile_name(
  KEY_FILE_LOCATION, SCOPES)

analytics = build('analytics', 'v4', credentials=credentials)